Sorry about length.

Symptom
I have an 88 Iroc with the 5.0 TPI (please note that the muffler is off and someone gutted the cat) I think the car is missing. It has lost power, Mpg, and shakes. At the same time it's running really rich. You can hear the car running poorly (i'll post sound files tomarrow) I get this in eather hot or cold, idling in and out of gear and while accelerating. Also when i'm driving and i'm low in what ever gear it starts to shake and stumble. I can feel slight surging when drving at any speed and when accelerating. Also a ticking or knocking sound can be heard.

When It Started
This all started after I removed the intake manifold so a shop could fix some aluminum around the thermostat. When i was dissasembling the engine to remove the manifold i noticed the distribiter has some rust on the pickup coil but not on the ignition modual.

What I've replaced
I have checked the timing, and firing order many times now. I have also replaced the cap, rotor, wires, and spark plugs, and PCV. They have had no effect. The O2 sensor looks new but i don't know how new (bought the car last april)

What I've tried
I've heard some people say that the egr can do this and to pull the vacume hose going to it. I did it and they have had no effect. I felt the fuel injectors for ticking and i could feel it on the drivers side and could not feel the ticking on the passenger side. Also two hoses that go from (one from egr vac lines and the other from throttlebody) are they both supposed to have some kind of vacume? The one from the throttle body does and the one from egr vac lines doesn't. And my car does not have the sticker that shows vacume hose routes so if anyone has a pic of that. it would be helpfull.

Basicly HELP ME. I need an expert :hail:

P.S. I tried to adjust my minimum air and when i started the car after unplugging the IAC the car dies. I have to manualy idle the car at 1100 rpms or so.

 

Check to see if you pluged the PITA air temp sensor underneath the upper plenum (towards the back). I have heard that it will make a car do this and it would be easy to miss when installing. Other than that pull the plug wires 1 at a time and see if the idle changes, if not you have a dead cylinder which may be from firing order being off(hopefully).

 

I know i got that stuppid thing because i found it unplugged right after i was done. LOL i had to use a fork tapped to the end of a screw driver to get it on.