I was buzzing along the interstate listening to the radio yesterday when all of a sudden over the music was loud, static-y, awful, want to hear the most annoying sound in the world interference. The pitch went up as RPMs increased and went down when the RPMs went down. It's constant and driving me crazy.

I've never had the problem before but I still shut off the cell phone, radar, and anything else that might have been causing interference with no luck.

I do have an aftermarket system in there but in 2+ years there have been no issues. Any ideas as to what could be causing this? Thanks!