WHAT'S THE PROBLEM?

	My brand new car stereo makes a static noise when the engine
	is running, but only when I play a tape.  Radio's clean.
	
	It's not tape hiss I'm talking about and it goes away as soon
	as I shut the engine off.  

	I've already put a new condenser on my alternator and a new
	set of resistor NGK spark-plugs and wire set.

	WHAT'S THE PROBLEM?