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Without much doubt, it it is points or distributor-related ... as nothing in the MFI could make your tach misbehave, and it would take two simultaneous failures to have mixture problems AND tach problems ... both at once!
I would recommend turning the engine over manually to Z1 mark on Cyl. 1, then pull out the complete distributor as a unit for further work and diagnosis, because they aren't much fun to work on in the car!
I suspect one of three possible problems:
1. Bad point set needing replacement
2. Loose point plate inside distributor
3. Broken/loose ground wire to point plate inside distributor ... the bare wire spot welded to the plate has been known to break right at the spot weld!
All three are easy fixes, but maybe not so easy to recognize to the inexperienced ... so let us know what you find inside the distributor!!!
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Warren Hall
1973 911S Targa
[This message has been edited by Early_S_Man (edited 05-01-2000).]
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