Re: Need help with engine problem
Is the tach still a factory mechanical tach or is it electronic? If it is electronic, I would try disconnecting it. Also, I believe you said this was GM HEI. If so, as I said before, I would swap the module or at least have it tested. Modules, coils, and pickups for HEI go out from time to time and can cause the issues you are describing.
Jason
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