Have a 04 Grand Prix GT2, all stock and this morning when driving home from work it started to like jerk every time the gear shifted or when I let off the gas, it still shifted thru every gear and pulled up hills and made it home, jst wasn't shifting smooth as normally. So I got home , shut the car off for 5 mins then drove it up the street and it wasn't doing it anymore. What should I think? Should I jst ignore it or should I take action , fluid is a bit dirty but I thought it would be a mount , trans or lower motor mount , but it threw me off when it stopped doing it after being shut off and on, sorry for the long story btw