car in question is my 91 GT automatic... the problem my car is having, is when i step on it, it falls on its face. like it is getting too much fuel, i hear it backfire through the intake. it runs good when driving normal or slowly accelerating it...but when i punch it from a stop , it doesnt go anywhere and when on the freeway it cruises good but when i step on it hard as if to pass someone or just go fast it doesnt go anywhere just sputters and backfires through intake if i step on it. very annoying...
so far i have changed the plugs, wires, fuel filter, 02 sensors, tps sensor. i am going to change the cap and rotor tomorrow just for fun. i have done a compression check and all the cylinders were 135+, not the best but it is 185K on the car. i did a vacuum check and that was good. i cleaned the iac . the timing is set at 10*. i put a coil on from my 88 mustang that is good condition. i checked the fuel pressure and it looks good it was like 45. i am going to put a MAF on that i know is a stock one, because im not 100% sure what the one on there is. it looks stock but the car came with 24# injectors so i guess it could be a stock looking 24# calibrated maf. i am also going to look and make sure my computer doesnt have some chip on it or something. what else do you guys think i should look for or do?
so far i have changed the plugs, wires, fuel filter, 02 sensors, tps sensor. i am going to change the cap and rotor tomorrow just for fun. i have done a compression check and all the cylinders were 135+, not the best but it is 185K on the car. i did a vacuum check and that was good. i cleaned the iac . the timing is set at 10*. i put a coil on from my 88 mustang that is good condition. i checked the fuel pressure and it looks good it was like 45. i am going to put a MAF on that i know is a stock one, because im not 100% sure what the one on there is. it looks stock but the car came with 24# injectors so i guess it could be a stock looking 24# calibrated maf. i am also going to look and make sure my computer doesnt have some chip on it or something. what else do you guys think i should look for or do?