I don't think I have any of those. Stock muffler.
Originally Posted by roger 04 rt
Check in the electrical box and see which Coding Plug (or if there isn't one) has been installed. Do you have any add-ons like Techlusion, Powercommander, BoosterPlug, iice air? Do you have a stock muffler?
The problem is either too much fuel or too little air. The guys/gals on this forum can get you there step by step.