I don't know if this should be here or in Modern GM and Non-GM.
The radio in my '87 Burb is acting "funny". (It has knobs). When I turn it on, its like there's no power to it no matter how high I turn the volume.
When I turn it off, the station flashes for a second - no volume because the knob is all the way down.
When I fiddle with the knob for a while, it comes on sometimes.
Its an original GM, with a cassette player. Its AM/FM, and I keep it on an AM station.
All the fuses are OK, and all the accessories work.
Any ideas?

Thanks!