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Stumble on accelaration 200 1989

posted by  TG on  Thu Aug 26 05:00 CST 2004
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last visit: Fri Aug 8 07:33 CST 2014
[RELATED]

Spark plug wires was one of my guesses too, but that didn't fix it when I replaced them. The stumble occurs In a very narrow part of the acceleration curve. The O2 sensor voltages actually drop to zero and sometimes show a few thousanths of a negative reading at this point, probably indicating very lean combustion. Just for kicks I unplugged the AMM, which had no effect on the stumble. The stumble is consistant, occuring on all low rpm acceleration from a cold start to a full operating temp engine on a hot day. When I press down harder on the accelerator, it will break out of the bad spot and accelerate smoothly right on up to cruising speeds, (if I keep the rpms up). If I accelerate slowly, the car stumbles and hesitates at that same rpm spot through each of the gears.






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