Sparkplug engine car shaking
Only my right sparkplug turns black every week and then my car starts shaking when I drive?
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When compression is low, the spark plug will usually become coated with a black, oily deposit.
But it could be something else. I'd swap the sparkplug and wire and see. If the problem now resides in a different cylinder, then I'll need to replace the wire and sparkplug. The ignition coil could also be the issue.
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