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.

 

Even though it shows no check engine light, check for codes anyways. If all things check out well, it may be a computer.

 

have you checked the cat temp should be even in and out

 

Not likely a factor, unless clogged. The O2 sensor is in front of it.

 

i found it pretty common for them to clog up on the 3rd gens i owned. i would at least check it out

 

That was my point. I meant the temperature of the cat would have nothing to do with it, also the O2 sensor is pre-cat, so unless the cat is clogged, it will have no impact on the A/F ratio or anything else. I do agree that they can get clogged, and that would severly restrict exhaust flow causing a host of other problems.