These Grand Prix have been nothing but problems for me this is my second one. My first one the engine died. Now this one 1999 GTP is having trouble. The rpms seem to jump like 200-400 rpms at some points. Only happens when I'm driving not idling. On the highway and streets, any help?
Thinking it might be the cat, maf,??? What else. I'm going to scan it tomorrow so it might pull something but there is no lights on at all.