2001 2500 I have changed the tappent cover gasket due to an oil leak. I bled the fuel system, it cranked and idled fine. It runs well and I haven't had any problems with power loss. Under light load, above 1000 rpm's, there is a very loud wind hissing jet engine noise while going up hill or under load. It goes away when there is no load or hill. Please post any ideas that you have or any suggestions for what I could do to fix it. Thank you.