i was getting off the highway today and while slowing and turning i suddenly heard the trucks chime going. i went off i believe 4-6 times. i figured i would look down and see a service engine light or somthing but no. merging onto another road the truck kinda seemed to be lacking some power but it was hard to say. poppped the hood and all looks well, fluids fine, no odd noises, check for codes and their were none. anyone have any idea? i have fuel, egt, boost guages and all were normal. i have no programmers or anything like that. just a muffler delet pipe. happen to anyone else??