My 2002 Sedona has been at the dealership for two weeks.  They called and said come and pick up the car, they can't find the problem.  My situation is...I heard a thud while driving on the freeway at 65 mph.  About an hour later the car stalled putting it into reverse.  Started right up.  While driving home going 65 mph, I had my foot on the gas pedal and all of a sudden the rpm's went to zero and got no response from the gas pedal.  Put into neutral and restarted car.  It seemed to only happen when misty outside.  Last episode...driving 40 mph same thing happened, however, it never completely turned off, so I couldn't restart the engine.  I put my flashers on and dealt with this for about 5 minutes, and then all of a sudden the car turned off and I put it in neutral and it started up.  I made one stop on my way home and turned the car off and when I restarted the car it kept stalling in reverse and drive.  I called and had them tow it.  The car also had a windex odor driving down the freeway, which was very strange.  The dealership has said they can't reinact what happened.  This problem only happens intermittently, so I can understand that, but...Any suggestions, I'm scared to drive my car.