OK so I have replicated this 3 times... So its not just a coincidence. If I turn on my A/C for about 5 minutes the car will start bucking and coughing. Turn off the A/C and it will continue to cough and buck and kinda feel like I'm losing spark or fuel. It never completely dies. It'll bog, and I'll floor it, then it'll take off like nothing was wrong.... If I haven't run the A/C for 30 minutes of run time It''l run just fine.
89 350 TPI.
Does the ECM tell the IAC to do anything when the A/C is kicked on? This doesn't just happen at idle....