Posted by Dean on November 30, 2021 at 19:14:46 from (68.39.250.176):
In Reply to: Weird Car Problem posted by john in la on November 30, 2021 at 15:47:21:
I once owned a 79 Trans Am with (Pontiac) TA 6.6 engine and 4 speed.
After a 2 or 3 years, it would stumble upon acceleration from light throttle, similar to what happens with a failing or mis-adjusted accelerator pump.
Tried to figure it out for over a year or so without success.
Eventually, it failed hard. No spark.
Turns out, the wire to the reluctor wheel in the distributor had failed inside the insulation but made contact during normal operation. Upon tip in from idle or low throttle, the vacuum advance retarded the timing creating a momentary open circuit in the wire which self-corrected after motion stopped. Wire looked fine and no visible evidence.
Never would have found it until eventual hard failure.
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