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tach jumping

Old Oct 27, 2000 | 10:33 PM
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tach jumping

well about a week ago my alternator died and i replaced that and now when i am idling my tach bounces around between 5 and 15. today i replaced the battery and coil and that didnt help at all. any ideas?
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Old Oct 29, 2000 | 10:05 AM
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SC,

What year/engine/fuel system do you have? There was a problem with the tach filters on some of the earlier engines, and there was a TSB on '87 TPIs for a similar problem and the wiring to the distributor.

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Old Nov 1, 2000 | 09:36 PM
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it is a 87 iroc. 305. tpi
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