Do you have an approximately 5/8" thick non-metallic insulator plate between the carburetor and the intake manifold?

Has the carburetor been rebuilt recently - the float level and/or the needle valve/seat might be culprits. One of the carburetor pros will post useful questions and suggestions.

double-posted: https://www.stovebolt.com/ubbthreads/ubbthreads.php?ubb=showflat&Number=650890#Post650890

Last edited by tclederman; 05/30/2010 4:32 PM. Reason: double-posting noted