took 4 carbs apart and into carb cleaner, after reassembly ive got idle problems, previously it had acceleration problems that are fixed, now at idle its fouling the spark plugs, I didn't replace any rubber or gasket material, it all looked fine, I could see the top cover seals plugged low speed control screw, im wondering if maybe this is where my new problem occurred, this carb also has a oring on the plug covering the pilot jet, is the pilot jet cavity pressure controlled by the air screw?