i dont know if this could help anyone i have been having problems for about a year. truck would run rough at idle took it to several dealers they found no codes and said nothing was wrong after doing some reaserch i found that the flywheel is dragging on the engine and causing balance rates to drop into the high neg. and the truck would try to compinsate and smooth out. so went to the dealer and shur enough the dealer found a tsb. hopefully this might answer some questions that some of you have. im going to get it replaced by the dealer but im going to SBC this summer