Why does the cd audio in my car become fuzzy when i have the engine on?

I have a clarion adx5555z double din in my 97 corolla and whenever I play a cd with the engine on the audio gets really fuzzy after a few minutes, but with the engine off the audio is clear , the radio and tape player dont have the same problem. Anyone know whats causing this??
I grounded the stereo directly to the chassis and I still hasn’t helped. Why wouldn’t the radio and tape player be affected by the bad grounding??

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Tags: Audio Car, Audio Tape, Tape Player