Re: vibration.........from where?????
The tach sounds as though it has a loose connection to the coil.
What kind of fan are you running? If it's a clutch fan, it could be bad. That and check all the blades, and make sure they are solid.
The mis could be causing one hole to not fire long enough to cause some funny business, especially if it is happening on either cyl # 5 or 7. But I'm guessing not. What kind of distributer?
Check everything that rotates off the crank.
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Chris
1968 K20 Suburban
1972 K10 LWB PU
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