vibration engine and RPM increasing and decreasing.
Jan 28, 2015 at 9:38 AM
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CARADIODOC
CERTIFIED EXPERT
34,306 POSTS
This is typical of a misfire. You'll have to supply some details or test results to be analyzed. Misfires can be caused by a vacuum leak, leaking cylinder head gasket, injector problem, spark plug problem, etc.