Sub Giving Feedback, Not sure what to check next. . . Options

[My94RedCelica]

Quick question for you all. I tried a search but didn't find what I need. I have a Kenwood in dash DVD player connected to a Kicker CVR 12" The set up and wiring was working completely fine, but after a week I started getting horrible feedback from the sub. My friend had installed the headunit, so I went back and traced the wires. He had the RCA, remote, and power wires running together. So I seaperated the RCA's from the remote wire and I still have feedback. I checked the amp ground. moved it around a little. Now I have a humming feedback, and it gets higer pitched when I hit the gas. i'm not quite sure what to check from here, so any advice would be appreciated!

[Digndoug]

You guys never mentioned the fact that if you're power amp cable is running by electronics in the engine bay, you may here a lot of commotion from that.  (example, running your power wire on the celi from the battery right across the spark plug wires or distributer cap)
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Well that would be just STUPID to run your power cable over the engine, I assumed and hoped we didnt have to go that far.

but yes that coudl cause problems.