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Stumble from engine at idle. 200 1986

posted by  sandkv on  Thu Apr 25 12:26 CST 2002
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Bricksters,
Update on my idle problems. Apologies for long post.
Cleaned IAC valve, cleaned throttle body, adjusted throttle stop, adjusted TPS, checked all hoses etc for vac leaks, re-cleaned flame trap, checked oxygen sensor, cleaned injectors replaced injector seals, new fuel pump relay and I inspected as many electrical connectors as possible. Car still idles at around 1000RPM (on car guage)and stumbles rythmically about 50-100RPM. Car will idle at 1500+ unless I dial the black idle knob all the way to the stops.
Performance of car when driving is great.
Stumbling? car will sit and idle fine (albeit high) but in a cycle, 2 seconds strong and even, 1 second stumbling (like it is misfiring)with RPM drop, engine shakes a lot. Other factors to consider include my slowly rotting wiring harness.
Could IAC be causing stumbling idle as well as high idle? Should I just get a new/second hand IAC and try it? Should I go to the trouble of replacing wiring harness? Could it be fuel pressure regulator? Anything else?
Thanks
Karl
86 245 188K Kms (117K miles)






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