this is the first time its happend and im sure it was nothing..but this weird thing happend..as I got onto the interstate, I got on at around 40mph and then since it was just me I opened it up and once I had it going around 80 I just hear this kinda high pitch sound...like it came from the speakers or something I dunno the radio/cd wasnt on or anything..once I heard the sound I just let off the gas and the sound stopped..then I got back on it and the sound was gone...the conditions outside were around 78* kinda humid and it had just rained about an hour ago...has that ever happend to anyone?