Hey,
I have an '87 Dodge with a stock audio system plus a CB radio. However, my normal radio only gets AM reception. If I switch it to FM it's just complete silence on any station, but very rarely, if I have it on FM, it will play for a minute or two and then just go away again, but the AM radio always works. What do you think could be causing this problem?

got a picture of the radio ???

Here is a link to the picture, the website wouldn't let me put it right on the thread. It's just the stock radio.

http://oi41.tinypic.com/10pyh3c.jpg

oh is aftermarket cant help you

It is the stock radio; it's the same as the one in the Owner's Manual and in the Chilton Guide Book.