Just off the phone with Holley. Their tech says 1 of 3 things. Either mixture passage is blocked or has trash in it, intake manifold leak, or fouled plugs. Cleaned carb last night, so I don't think thats it. Put new plugs and pertronix in few weeks ago...I'll pull plugs to double check, and I'll do the old carb cleaner spray on intake tonight to check for leaks. Thats going to be my guess. The real fun will be pulling the integral manifold off this weekend if thats the cause. Doesn't look like its been off in a long time if ever.
