I was towing last weekend and just about any hill I pulled the engine got real loud and sounded like the fuel pattern was "spitting". My egt's were hotter than normal by around 100 degrees (1100 to 1200). Sometimes I had to back off which I never had to do before towing my RV at only 7500lbs. The other thing I noticed was I managed 22-23lbs boost but the needle was shaking like crazy at and above 10lbs? Finally I pulled over and disconnected the Edge. To my surprise it pulled stronger. Egt's were in check, however, the boost needle was still shaking a little after 10lbs. The other thing I noticed was max boost at 22-23lbs. Huh? Same as with edge plugged in and I thought stock should be around 18-19lbs? Anyway, is it possible the truck has upgraded injectors which I don't know about? Help me out please with some ideas on these issues. Thanks.
Kevin
Kevin