This could mean a couple things. Either you have a eng misfire which is doubtful as your onboard computer would set a misfire code.
The other possibility depending on where you live could be ice on the road. If no ice where you are could be a prob in the ignition system causing an inaccurate tach reading. And the final possibility is simply a defective tach guage.
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Wednesday, February 2nd, 2011 AT 8:52 PM