ok i have a 1998.5 cummins and when i get into the higher levels on my edge at about 2000 rpm it just revs out it does this even on mileage mode. at first i thought it was my tps so i bought a new tps and it still does it. but it doesnt do it when i turn the edge to stock so i have no idea what its problem is. i also have these codes p237, p236, and p1693 and also p121 thats tps but it says pending