Idle motor "sticky"; check the connections. The fuel mixture could be changing drastically by the frequency valve. Check for vacuum leaks. Check for a clean connection at the frequency valve. Also, the oxygen sensor could be going bad on you. Harold McElraft - 3354 --- In dmcnews@xxxxxxxxxxxxxxx, id <ionicdesign@xxxx> wrote: > When the engine warms up to running temp the cold idle hunting is gone. > > I turn on the A/C with a warm engine and the idle hunts again. > > I turn off the A/C with a warm engine the hunting is gone. > > What is wrong? > > Mark > 6683