I am still having a problem with my stereo crackling while my car is running. It only does it when the car is running though. I have an aftermarket pioneer deck. So far, I have tried various grounding points, a new capacitor underneath the distributor, a new alternator, and new spark plug wires. And when I say new, I mean different. The stupidest part is, the crackling goes away when the motor is turning over 2000 rpms. Any more ideas for me to try? Thanks