So back at Christmas on the way to my dad's (10 hr drive) my truck started idling horribly at stops, gas mileage took a dump, and had a few codes. I had a P0447 code, O2 codes, and a few others that pointed to a vacuum leak. So I replaced hoses, idle got better, replaced MAF and air filter, more improvement in idle, seafoamed her,idle is getting better. Gas mileage still sucks compared to what it was, still have a little bit of a rough idle, and still have P0447 code. So I started diving more into the CVS, I go to check the two pin connector and the wiring, and there is no connector or wiring that I can see. WTF? Except at idle and the gas mileage, my rover drives, shifts perfect. So now I don't know if my truck never had the connector there, and this "vent circuit open" code is being caused elsewhere. Anyone run into this? Yes I have searched!