I was wondering if anyone has had this issue and know a fix. When restarting my cat after engine is warm it back fires and sputters under low idle speeds. If you put the hammer down it takes off and runs fine. Then you can slow down and run at low speeds again with no problems. Almost like it is loading up when started. I have changed jets, needle, float,put a new gasket on exhaust header, changed plug. Still same issue. Any help would be appreciated. It does not do this when engine is cold.