so I have a new ACDelco TPS, set to .5v, 20iac etc. I'm still having an issue where throttle closed reads .53 volts and I think that is causing my IAC to hang around 50 or 60 counts, which in turn makes the truck idle at 850-900 rpm instead of the desired 750-800... Could this be the problem, or possibly something else? I have no idle speed adders enabled that I know of.