My truck is finally up and running again. Its still has the same problem though. I replaced the IDLE AIR CONTROL sensor my shif solenoids are good but when i take off its very very sluggish and rough. Im going to run a new diagnositc check for additional codes. Any ideas. and what does the TCC sensor do? Now it also seems that my alternator is bad, could that be a source of my problem. Somebody also told me that it could be my thermostat since thats out of my old engine. (ZZ4 350 MPFI runnin about 525 HP) or my Mass Air Flow Sensor. I dont have all my vaccum lines hooked up either. any of them actually.