My motor rattling? under heavy accel exp with people in the car the valves tend to rattle. This is a 87 Vulcan LX. Ive had ongoing problems with the driveability and cant seen to figure it out. I think this is the cause of the rattling. Ive called around for a new knock sensor no one seems to have one in stock. This means thay must not go out much? Well anyone had liuck with one at all?