I found some information on the net yesterday saying if the P0101 trouble code persisted after changing the MAF sensor the problem could be related to the PCV valve. I figured for 3 bucks it's worth a try. Go figure. The service engine light was off before I left the garage. The car did not miss a beat this morning and gas mileage was over 25 MPG. Really good since it was snowing near Chicago and road conditions weren't the best.