NEVER MIND, , it was the timing light!! Tried another light and it's perfectly stable.. crazy.
..but it's still running poorly and a check of the CHT shows number 4 is about 120 degrees cooler than the other cylinders, guess I'll start a new thread for that issue. fun
QUOTE(Bill Meyer @ Mar 15 2012, 03:04 PM)
Don't think it's the light, works fine on my other cars. I've cleaned the dizzy and I'm fairly certain it's not that either. I've seen timing walk around a bit when the advance is sticky, but this is totally different. It's so erractic I'm thinking it's simply not firing at random intervals, as I only catch a glimpse of the yellow mark here and there. Bad coil?
QUOTE(vsg914 @ Mar 15 2012, 02:50 PM)
My first thought is to loosen the distributor clamp and make sure the diz is all the way in. At this point, with a fresh build, I would pull the diz and check it for anything that does not look right.
I'm assuming your not suspecting the timing light?