I have a 1990 300zx which seems to have two issues which I'm trying to figure out. Any help or pointers would be great. Firstly the stereo system seems to make a buzzing noise sometimes and only the center speaker works, the buzzing seems to come from the front speakers but doesnt always occur. I've taken the stereo out and there's a bose box in the back which has the left and right speaker input and outputs, taking out all the four output leads from this box (which I assume is the amp) doesnt seem to stop the buzzing. Secondly when I start the car there seems to be a smell of gas but I dont see any leaks around the engine or on the floor.