Engine Bay Noise
What's up guys got a really strange noise I canít track down. Here's the deal, I drive a 2002 with the 4.7, quadra drive and up-country suspension. After sitting over night I start the car and start driving. After I hit 2nd gear or sometimes around 15 to 20 MPH I get a rattle from the engine bay, it high pitched. The noise will change with RPM but only does in gear and moving. If I throw it and N and rev I get nothing. After a min of driving itís gone. I have tried everything, cats, heat shield, lines rubbing, ext. Has anyone heard of or experienced this? Call me crazy but when I do pull over and pop the hood i hear the PCV valve rattling like hell, replaced and cleaned entire intake still does it. Any suggestions welcome, Thanks.