So I have a 1989 Camaro RS TBI and needless to say it runs like crap when it's cold. And I don't mean the temperature outside but when it first starts up. It misses, tries to die, sometimes it does die! and sputters really bad. It's really annoying and I NEED to fix it. I replaced the EGR valve and the IAC valve. Checked the TPS voltage and it was 0.62v and at full throttle its around 4.6v. Also replaced IAT sensor.

The previous owner rigged it to where when the AC is on max it turns the fan on and visa versa. I don't know if this would have anything to do with it.

Let me know what you guys think thanks

 

Check your fuel pressure, should be 9-12 psi.
Do a coolant temp sensor test, you'll need an ohm meter. When the car sitting overnite the cts should read close to the outside temp. Measure it when hot too.

 

when was the last time the Plug wires, cap n rotor , spark plugs, ICM was changed?
are the spark plug wires in the right firing order as well?

before you get to techical with the hard stuff check the easy stuff first..