mach 460 stereo help

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I have a 2003 Mustang Conv with the Mach 460 sound system. I recently installed a JVC KW-XR810 2 DIN CD Receiver in replace of the stock HU. I have been in a battle with this engine noise in the front door speakers only for 2 months now. I have upgraded all the ground wires and it will go away for maybe 3 to 4 days and then right back. It actually cuts the front door speakers out almost completely. I have swapt amps front to rear and makes no difference I still get noise in the front door speakers. I have swapt the RCA's around on the back of the HU and still only get noise from the front. So I have ruled out the HU, AMP and I think the ground so wtf else could it be? Maybe the door speaker wire is touching ground? I need help
 
Just as an update!

Before you go through all the crap I did, check the wire connection behind the driver kick panel! This was the culprit in my issue! WOW! What a nightmare but glad I found it.