"Bullfighter", I don't have the High ALT Pulley on mine. I'm not, nor have I ever experienced the phantom revs either. I'm currently running canned tune (ripp36_2.0) and this is the tune with which I started to get the CEL codes. I'm going to go outside now and Unmarry the T-1000 tuner then reset the PC according to "Useless Pickles" then update the tuner (again) and finally reload the tune to the jeep. If only Ripp could recommend a shop in SoCal that could perform and troubleshoot. I'll let you know how it all comes out.