can anyone tell me what the deal is with my car. i have a 98 gti 2.0, i lost a lot of power. i cant rev past 2500rpm. it tops out at around 60mph. am i screwed? when my a/c is on my car stalls when idling. the engine check light has been on for a while. the place that is supposedly supposed to fix my car is laggin. anyone know what my problem is??