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Shuddering Tach


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this just started this weekend, and I am finding I am getting more and more anal about the little details of having the car nice.

it is almost acting like a grounding issue, but the tach is fluttering about 200RPM regardless of engine speed. (ie if actual engine speed is 3k, the tach will bounce between 2700 and 3200; the needle will never sit stable) (also, no codes and all other gauges work fine)

If it is a ground issue, where do i begin, and if not what else?

Thanks in advance


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The jumping tach. Any jumping tach almost always is a ignition system issue.

It can be anything....from 'green' connections at the ignition module to a bad plug wire.

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