car still diseling run on prob

run on is usually related to the carb having to be open too far at idle, and that is usually from not enough initial timing. The issue is the engine has enough inertia to continue to draw fuel thru the boosters after the idnition is shut down, and the chamber has a hot spot of two enough to light the mixture. So, try a cooler set of plugs, more initial timing, and re-adjust the idle speed and mixture. What engine is this again?