rough idle and low power
bought truck 2 months ago...ran perfect, noticed a couple puffs of white smoke when getting off freeway 2 weeks ago. did not get hot or lose more the half gallon of coolant. replaced egr cooler and did a egr delete. truck started right up after priming but runs rough at idle, has no power until about 2000 rpm, even then has a skip. shows no codes with advance auto parts scanner, went and bought a sgt live wire scanner, still no codes. ficm is good, doesnt lose coolant or oil, no exhaust leaks . ran perfect before , cant figure this out ???