My engine is surging at idle when cold, and when it's warm it will revving up all by itself. I backed up on the idle adjustment all the way, and disconnected the trottle linkage. Still going up. At about 4000rpm I just shut it down with the stop handle, because it sounds like it wants to keep going even faster. The last owner took the car to a dieselshop where they replaced some gaskets in the dieselpump. And charged him $1000. They weren't able to fix the "idle hone".