irish236

I have an 05 Solara with a radio problem. On AM stations especially stations not in the immediate area there is a tapping sound. The fast you go, the quicker the tapping. When the engine is idling there is no sound, step on the gas and tap tap tap. They have replaced the radio, alternator, and suggest I listen to FM stations. To me it sounds like the interference from the engine is a wiring issue. At this point an help would be great. I have had the car to the dealer 5 times with no improvement or hope. Thanks for any insight or direction on get this problem taken care of.