Just picked up a Mazda 2300 with the 2.3 the truck has been sitting for 2 years, I basically had it given to me ... it had a 1/2 a tank of don’t know how old of gas put some sea foam and octane booster and topped it off with 8 gallons of 91 octane gas , did plugs wires and air filter, it starts and idles fine purs like a kitten. Step on the gas pedal and coughs and sputters . Where should I start looking ? Maf, throttle position or ? Any help would be great.