Trying to smooth out my idle, only to find that if I begin to close the primary butterfly slightly the idle begins to run better. I have all new vacuum lines and thick carb gasket.
A vacuum leak cannot be found anywhere. Any suggestions?
How did you check leaks? And did you check the carb gasket? The gaskets on the carb itself? What are the build specs and engine size? Once the butterly closed a bit, it introduced a restriction that speed up the air. What is the vacuum reading with the slow idle/fast idle?