We hopped into the mustang to go to my belated birthday steak dinner and it was idling rough and a little high. The AF/R was pretty high. So I shut it off and waited until this afternoon to look at it. Was thinking maybe I should look for a vacuum leak and sure enough the hose that goes to the boost/vacuum gauge was floating around and the nipple on the Whipple lower manifold was wide open. The rubber adapter had split and come loose. I decided to replace the nipple with a smaller one that did't stretch the rubber so much. Fixed it up and now she's running great again.