DPFDP, What is yours running at idle and 1500 rpm on a flat? DPF Differential Pressure Im at 0.0 - 0.1 on idle and 0.1 - 0.2 at 1500 rpm. Im just curious. Thanks if you add some info much appreciated.

Just drove on freeway 300 mile trip, half way here howling type (resonating) sound started. can quite figure out where it is coming from. annoying, but comes and goes, constant for a few minutes then stops, and comes back at slightly different pitches. below 60 mph does not make the sound...

Anyone else notice the car vibrates in this rpm band? I hooked up my vTuner to it and "sees misfires" at this range but no other ranges. I seriously doubt they are actually misfires based on my fuel economy being great and they don't show up anywhere else in the rpm band (My understanding is...

So this weekend I took a trip from OKC to El Paso TX and only got 31mpg avg on the trip... I have the plugs at .035, reso delete, and tires at 45psi... I'm not real impressed with the MPG's but I am happy that it is better than my other vehicles. I was averaging about 80mph on the way there and...

I have a very clean one owner 2003 GMC sierra 1500 2wd 4.3L automatic pickup. Pewter exterior with charcoal cloth interior. I have silverdo 16" wheels on it with newer tires. It has a clean title. I have service records from day one in 2003. All service and maintenance done at the Chevrolet...