I have the same problem!! I purchased mine from my husband's grandparents, they had bought it brand new with 14 or so mile on it. I had it for 1 mo and the trans went on it, then when I got the car back it started to jerk, couldn't gain any speed unless you went down to third, now my cruise doesn't work, trunk won't open, tail light indicator keeps comming on (tail light has been replaced) My husband fixes cars for a living and we have a HUGE support system for technology and NO ONE can figure the problem out! We have changed the fuel filter & pump, spark plugs, sensors, etc... When we hook a computer up to it, it states that the car is misfiring...duhhhhhh I already knew that! But because the service light isn't on we can't find the problem..Very frustrating!! Even mechanics can't figure it out! Any suggestions would be GREAT!!!