Ok I need some opinions, My HK sound system now has a sizzling crackling sound that is extremely loud. It does it when motor is running, when the engine is off stereo sounds good. The crackling does not increase with rpm's it remains constant. So what do you think, plug wires, coil, or something else. I want to get it corrected before I head to Fontana.
Yup ^ Ground on HU and also check your battery ground and motor grounds. Also check the coil buy sanding down the ends to get rid of any rust. Pay attention to the two back ones.