I bought a 94Z28.Was told the trans was bad.I already knew it was more than that but had no idea.The trans,comp,harness and much else had been replaced with 93 parts.This car is becoming a nightmare. I first replaced the trans,the computer and engine harness wiring.It was idling very high,backfiring out the intake and just rough in general.Replaced the 02 sensors,egr valve,egr vacuum solenoid,idle air control valve and checked and double checked all connectors and wiring.No more codes but still rough,idling way too high.Another issue....on occasion the ac pump,fans,all the relays,all the sending unit switches and the engine light will flash extremely fast for a few mins.On/off.The car was running well and idling fine with the 93 parts but could not get in the comp. and it was putting out raw fuel and the fans were staying on. ANY help I could get would be soooo appreciated.This one has me stumped!!!!!

 

Were you unhappy with the info you got in your first post about this?

https://www.camaroz28.com/forums/sho...47#post6602547

You have far too many things going on that we can help with. Perhaps if you can narrow down one or 2 we can give you direction.

Was the harness you purchased new or from another vehicle?