I have a 99 that has lost its mind. It keys and talks, is on freq, and is a bit overmodulated but not enough that the mic gain wont take care of it. There is nothing in the radio that I can find to start tracing from. There is no bleed over and really should be, with me rite across the hiway from a truck stop. I tryed replacing the RF gain which is a 1674---NADA...I have banged my head on the wall--that didnt help either. I just dont have a clue..R.B.