So it turns out the IAC valve was bad and once I replaced it it started right up and idled at the regular 1000-1200 rpms. I haven't driven it much because of this, today was the first chance I got to take it into work. it has more power and throttle response, I'm watching for the mileage yet, no change today. tail pipe still had some smell yesterday but there is 224000 dirty miles on it so it might take a while to clean up. The video of teh install is on Gadgetman Michael's youtube channel if you'd like to see more about it. the van ran fine at first because I left the evap hose off the throttle body and it was taking the idle air in through there. once i fixed the evap line I had issues. thank you all for your help I'll keep you posted on mileage changes.