Having a problem with my truck. it seems to be surging no matter how low i turn the idle screw down. Spraying carb cleaner had no effect on the linkages but when i sprayed the front of the carb near the base at the gasket (while it was running) it started to bog down.I am taking an educated guess that there is either a leak at the base either at the gasket/insulator or a crack in the carb base.Anybody else have this problem? I cant be the only one.