Ground issue is definitely the problem.
- Make sure your amp is grounded well. Use a locking star washer and clear anything that isn't raw metal with a wire brush.
- Return Ground. Run a small wire (20-ish gauge, same as remote turn on lead or similar) and connect the ground of the radio and the amp together. You can land the wire either on the (-) terminal of the amp or use a ring terminal and go to the body of the car where you grounded the amp.
If you want to test this theory you can just run the wire through the middle of your car and hold it to the amp ground and the chassis of the radio. I've had good luck with this practice in the past and make it a habit on any amp install I do, regardless of whether it's a speaker or sub amp.
The shielded RCA's speedfreek is talking about would do the same thing, but would also shield the RCA's from the power wire if you did happen to run them down the same side. 18" gap is the minimum recommended spacing from power to signal wires, and yes, always try to cross at 90º angles.
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