Posted 12/12/2024 12:38 (#11006151 - in reply to #11006122) Subject: RE: How to do a compression test and leak down test on Chevy small block quesions.
I doubt you have a compression problem if it runs good up to 3500.
I agree, it is probably an ignition of even a fuel / vacuum problem.
Does it have an electronic ignition? It sounds kind of like a condenser problem I once had.