[edwhite7]

I noticed in the original post you stated that you had the bypass hose installed. I had this exact problem and it went away after I plugged the bypass and started running water wetter. I am sure others will disagree but I am convinced that the engine is to far from the radiator and the pump will bypass rather than pump through the radiator at idle. I also drilled some 1/8 holes in the thermostat to help it bleed air through the system and installed an overflow tank.