Transmission- Not changing gears. Only allowing the car to go at 25mph running at about 3,000rpm. Sometimes it will shift, just not go into "cruise drive" which allows me to go about 65mph running at 3,000rpm. No power when you accelerate, it "putts". Took it to auto parts store, it comes up transmission module, but wont tell which one. Is this a sensor that could be reset, or a more technical problem?