Upon returning to idle from a rev up in full advance it's lean. Or a miss.
It's 12.8 at idle, then it's 14.2.. right?
Should be 13 something or so at idle and richer at throttle. Unless I'm reading this post wrong.
Is this a dial back timing light?
No dial back timing light. I can lean out the mixture with the a/f screws to get into the 13's.
I just found it strange that the mv is perfectly stable at idle, and gets a little erratic in the fast idle zone. I might try the vac gauge on the manifold fitting instead of the car base and see if that makes a difference.
I was just concerned that it may be a vacuum leak........I tried a propane torch around the carb base and intake with no change in rpm.