Today I was driving my 85 300 td wagon and all of a suddon the engine started racing. As I accelerate it would not decenerate. I had to throw it into neutral several times just to get it to stop. I mean, when I threw it in neutral the tac would jump up to 6000 rpm'(I hope i did not damage anything doing that) The pedal also feels funny. I had a hard time getting home, it was like I was fighting the car to hold it back. Someone please help!