Ok, so today I noticed at all red lights that my car/engine does this little thing kind like pulling me in bumps and stuff. It's very weird, no clue what it might be, any ideas? It's difficult to describve, it's like it pulls forward but now at a steady pace, like pull ... pull ... pull ... etc. It's only when I'm at a light or my car is stopped. 97 Auto GT, any help appreciated.