Quote:
Originally Posted by Shiny
.What I do know is the exhaust is stifling. It doesn't smell like gas...
So where do I start?
Mike
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My guess is a vacuum leak bad enough to overcome the rich carb settings.
A mismatched or damaged intake gasket could be an issue on a new build, or a leak at the carb base.
One trick I used in my pro days (70s) was to hold a shop rag over the carb horn and crush it somewhat to vary the density of the cloth. If the problem diminishes you're likely to see idle speed up and smooth out. Then you go looking for the source of your leak.