02 lb7 4x4 was taking the trailer to the landfill. Got diesel 10 min before entering landfill . Got to the landfill dumped. Leave and the truck starts idling rough like it had a miss. So I go to another gas station fill up some more still idling rough could hear like a pinging sound from the bad idle I thought she was a goner. So I decide to drive her some more see if it clears up she's bogging bad. Is it time for a wreker a new truck? Nah hit the pedal to the metal and drove back to the jobs site. She's been idling fine for a bit gotta keep my fingers crossed. Anybody else run into bad fuel only other thing I could think is the air filter let dust through and it got on the maf. Maybe a bad head gasket but no white smoke. Doubt a stuck injector cause she would have been blowing black smoke, right?