Originally Posted by bobfbigman

I would pull the Exhaust Back Presure sensor wich is located on a stainless tube right by the center of the drivers side valve cover, pull it off and clean it up and clean out the tube, I would pull the tube off to clean it because if you spray alot of carb cleaner through the tube you may get a big backfire when you fire up the truck. Its free and easy to do and can cause little problems like this if they get plugged up.