Okay. Last week I said I posted my last post, but finally kiddart answered the question - what EFI system do you have. I have to respond now because I support both FAST and Holley. Neither the EZ-1 or the EZ-2 is a good choice for an engine with low idle vacuum. I agree with Monte - you should have a system that at least lets you connect with a laptop if you need to. The upgrade that Kiddart is referring to is a change in the hand-held, but you still cannot link with a laptop.

A common band aid when an engine is near the edge of too low a vacuum is to advance the intial timing. Going up to 20 or 22 initial might make the difference.