Had a sudden engine knock noise start at idle. Just pulled the motor and discovered the damage. Junk Accufab throttle body screw came loose. Did a search and found others had it happen to them. wish I would have known about this last week when I still had a motor. Sucks cause the motor was just out less than 100 miles ago. I guess it can sit 3 more years now. Check out the pics on the link in my sig. EVERYONE CHECK YOU SCREWS if you have a accufab TB.