i might have an easy fix to a stupid mistake. i was tightning the scrader valve and accidently turned the top part and now it leaks, is this why my car hasno power.. it runs but has no power. no backfires or pops. no cels, replaced all sensores. one other possibilty is that i have a bad dis ground. i have no crossover plenum bracket and the big thick grounding strap is located by the throttle body on my car. also there is a plug which i cannot find the other end for. it is grey square and inside it has a three or 4 pin cicrular with a red strip on top..