[chicklin]

Well, so much for that. Same symptoms today. Spitting noise in the exhaust, feels like it's choking on the highway. I verified that the choke is fully open when warm. The acceleration is better due to the timing advance, but it still feels like it's working way too hard to stay up to speed.

So, I'm still either running rich or not getting a complete burn (or both). What else can I check? If it is a valve-train issue, are there any diagnostic tricks I can try short of pulling the covers? I have very steady vacuum on the gauge, right at 18".