my truck seems to run rich when its cold. thats what it sounds/feels like anyway. clears up as soon a i go down the road a little,but if i start it up and let it idle in the morning it sounds crappy. i started having this problem when i was messing with the throttle body,swapping back and forth between the stocker and a holley. did the same thing with both units. only thing that changed was a installed a TBI spacer from CFM tech. so i guess ever since i put that on ive had this problem. could that causs this condition? what sensors does the computer read when the engine is cold? is it closed loop or open loop at cold startup? i forget. thanks in advance.