Well, I am not mechanic but the resonance chamber on Subarus were on the air intake and did two things; they tuned the sound and did something to the air flow as it went into the intake. It is one of the items that Subaru guys who like to mess with their cars take off, it gives the engine a better sound according to them. It is also something that many people take off when they put in cold air intake systems.
Going @#%$^@$ crazy here!
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If you knew about a fuel pump issue, I’d start there. I know it’s easier said than done but I’d check the volts and amps from the pump, if it’s getting weak yeah you could have those issues. Or check the output pressure of the pump. 
Yes, I was informed of this possible issue; however, #1 when I first got the truck it actually started and ran good other than occasionally having to pull over to vent the gas cap. #2 up until the weather changed and got colder in like Sept. or Oct. then my issues began. It would start and idle just fine but as soon as I applied any amount of pressure to the accelorator and held it like floored, the rpms would drop and would run really rough, spit and backfire and would "surge". The instant I took my foor off of the accelorator, it would recover and the rpms would go back up to 1500. Sometimes if I very lightly pressed the accelorator, it would go up to 2000 rpm but more when more pressure was applied, it would cough, spit, backfire and any other adjective you'd like to use. I now let it idle on cold start for about 5 min. I then play with the accelorator and turn it off for 2-3 minutes and turn it back on again. If the results were the same, I'd repeat. Sometimes, this will speed up the process as when I restart and rev the engine and the rpms jump up and continue to stay up, I'll be ok but it the rpms drop off irregardless of what I do, then I repeat the process. Once the engine warms up and I drive it, turn it off and restart before it totally cools down, I'm fine but if it gets too cold, I have to do the same process again. I'm thinking this is a seperate issue from the gas pump as I'm pretty sure the gas pump doesn't care about engine temp. I could be wrong!If you knew about a fuel pump issue, I’d start there. I know it’s easier said than done but I’d check the volts and amps from the pump, if it’s getting weak yeah you could have those issues. Or check the output pressure of the pump.
As of this moment, I've replaced the air filter, cleaned out The MAF and sprayed some throttle body cleaner with the engine running and the air intake removed up to the throttle body. You can see pics of the airliners new and old side by side, nothing out of the ordinary there. Also a pic of the butterfly valve shut as it should be. What I did find interesting was the black line outside of the exhaust pipe after spraying the throttle body cleaner into the throttle body. J'll post pics in this order. Any more comments or suggestions are welcomed. Thank you
Like I've said a couple of times now......take a look at the ECU if you haven't yet. There are two original capacitors that will leak and etch the circuit board and then corrode the thin copper imprinting on the circuit board.......THIS IS A KNOWN ISSUE! It happens to all of the factory ECU's. Some last longer than others......some have already been "rebuilt"......some have been rebuilt well, some have not been!
Here is a factory ECU in pristine condition.....the RED & BLACK Capacitors are the culprits:
![Passive circuit component Circuit component Green Electronic engineering Electronic component]()
![Passive circuit component Circuit component Hardware programmer Electronic component Capacitor]()
Here is a factory ECU where the two red & black capacitors have leaked and repairs have been attempted......the BLACK capacitor has been replaced.....but this ECU still had issues:
![Passive circuit component Circuit component Hardware programmer Electronic engineering Capacitor]()
![Circuit component Electronic component Audio equipment Tableware Gas]()
![Circuit component Passive circuit component Hardware programmer Electronic component Electronic engineering]()
![Circuit component Passive circuit component Hardware programmer Gas Computer hardware]()
Here is a factory ECU in pristine condition.....the RED & BLACK Capacitors are the culprits:
Here is a factory ECU where the two red & black capacitors have leaked and repairs have been attempted......the BLACK capacitor has been replaced.....but this ECU still had issues:
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IF.......your ECU IS bad......you may want to check this company out......
modulemaster.com
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Hi "Axel". OK, so I've removed the ECU for inspection. For all intents and purposes, it appears brand new! I going to attempt to attach photos here. There were zero signs of corrosion or leakage whatsoever. You can see for yourself. Who knows maybe by disconnecting the battery and removing the ECU it may clear itself (wishful thinking). We'll see after I reinstall it and reconnect the battery. I'm still perplexed by the real rich rich exhaust and the thick black soot on the floor left when I do bait going. A residual from the throttle body cleaner? Anyway, it's always had a very rich odor in the exhaust with piss poor gas mileage. My best options are checking/replacing the two thermal sensors and a tune up. Like I said, when I first got the truck it started and ran fine but when thr weather changed, so did the truck
![Passive circuit component Circuit component Computer data storage Hardware programmer Electronic instrument]()
![Passive circuit component Circuit component Computer data storage Hardware programmer Electronic instrument]()
![Circuit component Passive circuit component Hardware programmer Electronic engineering Electronic component]()
![Passive circuit component Circuit component Hardware programmer Electronic engineering Electronic component]()
![Passive circuit component Circuit component Hardware programmer Electronic engineering Audio equipment]()
![Audio equipment Computer hardware Electronic device Machine Electronic engineering]()
![Circuit component Passive circuit component Hardware programmer Electronic engineering Electronic component]()
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