Sounds more like a transmission problem to me. Is the check engine light on? If yes first step is to read the codes, even if you need to buy the scantool and bring it to the car! Autozone reads the codes for free, try shifting it manually, start in the lowest gear 1 and shift up with your shifter, does this help? Check fluid level and color.
Friday, January 8th, 2010 AT 3:02 AM