So my 1990 gtu was messed with a lot before i got it. somebody adjust the throttle stop screw, the idle screw, and the tps adjustment. the car rund weird the rpm's jump up and down a little bit when idling and hesitates at the top of the gears????? Anybody know how to get back to stock adjustments? And any online diagrams for removal and cleaning of fuel injectors and aux. ports??