I just drove back my new 1998 pontiac grand prix daytona 500 from tucson to nogales and it barely made it I just am so furious with the previous owner. It runs and drives perfect for the first 30 minutes then the engine starts losing power and cutting out same with the electrical, its not overheating, it has a rough idle now, and the electrical is constantly cutting in and out with the hud blinking "LOW" am I screwed?