Question about 1993 Pontiac Bonneville
A bad ignition coil is probably not the culprit, it would likely do it at more than one speed if it were a misfire caused by a coil. It is hard to say without actually driving the vehicle. It could be as simple as a wheel out of balance or a defective tire.
I would start by trying to isolate if it is engine vibration or something in the suspension or wheels. Once that is done it would be easier to diagnose it further.
Posted on Jul 25, 2009
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Posted on Jan 02, 2017
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