Never had a problem with my 04 2500hd since I bought her new but, got one now. I`ve had a p0300 & p0171, terrible miss, horrible tail exhaust, and can`t find the problem? Plugs wires all check fine. Thinking of taking it to the dealer to see if their computer can tell me any more before I start replacing random sensors or what have. If I get the same results from the dealer, could anyone tip me off with any suggestions that are more common with this truck? Thanks

 

It was bank 1 o2 sensor. Good as new again

 

Sorry friend I missed this one. Glad you got her fixed!! Bet ur gas mileage will be alot better now.