Scott, I first hook up scanner and check tps when cold, then key on after I take it off and I push butterfly till I reach same position then mark throttle, but before you groove use the card trick Ron uses just to mark, this will hold it in place, cut groove at 15 degree angle full depth following butterfly there is about a 32nd ridge youll go through both sides, after groove is cut bevel butterfly slightly as to help air flow. Plug pcv and also the 90 degree tube on back of throttle body , this creates more vacum before butterfly which you wouldnt think makes a difference but it does as it creates an even flow to the intake. Dan Gadgetman Mo.