Finally figured out my bouncing idle. There’s a valve that opens and closes, but the water temp, located on the intake manifold. Its purpose is to help with starting in cold climates. Well it was stuck open a bit allowing more air in. I don’t need the thing here in FL, so I blocked it off and ran a nipple to the in and out coolant lines. Idles at 850 all day now! Score one for me! Took a bunch of try’s to track this down!