ok i had a built y7 tuned on crome.. i swapped headsto a z6 and disabled vtec and made a basemap.. the car has like a miss at idle and when u load the engine.. and has no power.. it was fine before i changed the head and the head was reworked and cleaned... wtf.. i got a new dizzy and plug and wires.. it sounds like a freakin subaru when u drive it... ughh im about to pull out my hair