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Re: Jumping Tach?
Auto or 5-spd??
When it's idling, you said you felt it with the engine shaking a bit, that to me isn't a sign of a bad tach, but rather a miss in the engine. If the tach itself was the issue, you wouldn't *feel* it in the engine.
At highway speed, your tach *could* be off if your clutch or tranny's slipping, or again, if you have a miss.
Which sparkplugs did you use?
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