Hey guys, first post here... First off its a 1992 v6 auto . Here is the issue: Car starts and idles great, runs perfect until it gets warmed up. Then, out of no where, all hell breaks loose. It feels like fuel is suddenly restricted (or its starving for air) RPM jump around like crazy and it stalls out most of the time. I can floor to barely keep it running but RPM keep jumping around. It keeps up the same thing until you shut it off and let it cool. Not giving a check engine light. So far i've tried: fuel filter, spark plugs/wires, cap, rotor, fuel injectors, egr, tested MAP sensor, o2 sensor, checked (most?) vacuum lines, fuel pump. So... if anyone has any suggestions before I blow this f'ing thing up, it would be greatly appreciated.

 

Try replacing the IAC (idler air control) that could be your problem. And if that dose not work, make sure you can get out of the car before you drive it over the cliff.

 

please create 2 lists

what has been replaced

what has been tested

and, it sounds like it runs fine when cool before it enters closed loop

 

The only thing I tested was the MAP sensor and I checked around for leaking vacuum lines, everything else has been replaced. I'll check that IAC next chance I get. Thanks guys.

 

The first thing that went off in my head is the temp sensor. It tells the system to go into closed loop. I have had problems with bad temp sensors although unrelated to the one you described.