We are working on 2006 cat c7 top kick truck with only 11,500 miles....its already on its second motor ....you couldnt ask for the truck to run any better until it reaches operating temp...then its surges at idle..looses power....have had it even totally stall out....we have tryed to pull the codes and it dosent have any codes in it at all even after it stalled out....any help would be greatly appreciated thanks