So i have a 1994 Camaro Z28 A4 and about a month ago ive had an opti failure, so of course i went and replaced that along with plugs, wires, and coil, the plugs are NGK TR55's and the car ran great, the opti was an Oreilly's brand. But i was left on the side of the road not even 2 weeks later, so i thought oh man shouldn't of got that opti, so i then went and got an AC Delco optispark, replaced that and it wouldn't fire up, turns out the ICM was bad, so simple enough i went and replaced it. i come to find out my rpms were 200 too low at idle and my transmission wouldn't kick down, my friend thought it was the TPS so i ended up replacing that sensor. I thought it was the computer not reading the ICM right. So i disconnected the battery waited 10 minutes and plugged it back in, it then ran fine. i did a couple of pulls and drove around a little bit, but then the idle is again too low, im running about 500-600rpms at idle im usually at 800. then the car seems to feel laggy or doggy, like its chugging a little now.
Would anyone have an idea what i might be missing? anything that could be the problem? its like the timing was retarted but thats impossible since its a splined opti going in only one way.
I also did the coolant bypass while i was doing all this, car also has headers, no cat and flowmaster muffler, no egr, and no smog.

 

take your 02 sensors out and see if they are fouled. have you checked plugs for fouling? sounds like you have a sensor thats giving false reading and computer is adjusting based on bad numbers. test your temp sensor on front of water pump. http://shbox.com/1/4th_gen_tech2.html#ect

 

I will give the o2's a try and the temp sensor. Ive also tried the Idle air control and TPS as well, still have the same problem so those sensors have the green light. Plugs haven't been fouled, as far as i know, i only checked #1. I'll check the sensors you listed and get back to you on it.

 

Have you scanned for trouble codes??