Today I noticed that the hunting my D has at idle seems to follow a particular pattern. At idle, my tachometer jumps up a hundred rpm or so for a split second and drops back to "normal idle" (during this time the engine has no perceivable change in speed) , then the engine revs and drops back to idle speed. Sometimes the tach jumps once prior to this cycle and sometimes it jumps 2, 3 or 4 times. The higher the number of jumps, the higher and longer is the rev. Is this diagnostic of anything? Dave 6530 [Non-text portions of this message have been removed]