my pontiac g6 3.5L automatic does not shift right. it was fine the day before and now when im driving it has no power and the RPM goes way up and i can only go 50km/h. when i let off the the gas it shifts but as soon i put my foot on the gas it is guttless and the same thing happens. there is no warning lights on my dash. does this mean i need a new transmission? has anyone else has this problem?