I have a 87 Trans Am with a 88 Trans Am TPI 5.0 engine and tranny in it and after swapping it all out with the engine harness from the 88 TA to my 87 the car wont idle worth ****. Espcially when the engine is cold, after its warm its better but it wont idle at times. When it was in the 88 TA before i pulled it you could start it without giving it gas, but now it will start then i will have to give it a little gas just to keep it from not stalling at idle. I think my cold start injector is bad. Could this cause all the problems even after the car is warmed up and still wont idle very good? Fuel pressure at the rail is 45psi at all times. I have to keep my foot on the pedal in order for it to not stall on me. What other things could it be or to test for? Its not pulling any codes either. Your help is needed!!!

 

Are you running the engine with the '87 TPI PROM?

 

when it dies do you smell gas?

 

yes it does smell like gas when it dies. and no i have the 88 Prom in it

 

tap on the bottom of the mafs while the car is running with a screwdriver handle- the part where the harness plugs into

of the idle changes then the mafs is on it way

I could go through a list of BS but lets take one step at a time

screw it: step two

ohm out the injectors to check resistance

after running the car pull the plugs one by one to see if some of them are wet

pull the injector plugs off one at a time and try to start the engine, and let us know if it ran better with an injector disconnected