i got a 89 gta 5.0 the car starts like a champ, then ruff idles for about 45 seconds then dies. i have good spark, proper fuel pressure, brand new MAF, EGR,IAC,MAT,TPS,and o2 sensor.but when i hook the car to my laptop i get sparatic 02 and MAF readings. it also cant tell the rpm half the time. im starting to think i have a timing issue but when it first fires it is a smooth as a new car any ideas?

 

check your plug order, same thing happened on my friends 89 GTA, we misplaced one of the wires and it did the whole awesome car to complete beater move

 

Did you adjust your tps when you replaced it, that sounds like my Iroc before I adjusted it.

 

89 5.0 gta?

 

i know i got the plug oder right i checked it 3 times but ill try messing with the TPS some more thanks

 

Are you still using the original injectors? Could have some bad ones that could cause that issue. I would make sure that the injectors are still good.

 

it does have the stock injectors but i don't know the tolerance's for them. i did try reseting the TPS, it was slightly off. that made things a bit better,then i reset the idle air. witch also made things a bit smoother. the funny thing to me is that for about 10 min the car ran perfectly fine, then it started dieing out again. i think that the IAC or the ECM could be bad tho,because sometimes it would run fine with the IAC hooked up but 2 min later it would die again and if you unhooked it it would run fine for a bit. oh yea and the car was warmed up and in closed loop.