Everytime i press the gas, the throttle sticks, and i have to undo it at the t.b. with my hand. There arent any codes. I figured it could be the t.p.s, but wouldnt i get a code if it was bad? Also, There is no purge control plug on my 88 si harness, so i didnt use it at all on the z6 i.m.. Could this do it?