I finally got a chance to work on this. Pulled the MAF and found it to be perfectly clean. Pulled the throttle body and found an indication what the problem might be. There was a small oil slick just upstream from the throttle body that originates from the PCV hose.
I'm thinking cracked hose (which I'll be checking for in a minute) or a bad PCV valve. The problem is, I don't know where the PCV is. The motorhome engine seems to be different from the truck and van engines. Can anyone shed some light on this? I'm really hoping it's not INSIDE the valve cover.
Thanks!
Mike