I have a stock 2002 Expedition XLT 4x4 and I am recieving what I think is some kind of electrical feedback noise. It goes in and out when I'm cruising at steady speeds in town and on the freeway. Sounds like a high pitch whining noise but as soon as I apply more gas and change the speed it goes away. Has anybody else dealt with this issue. It's not hurting any performance that I can tell but it's extremely aggrevating.