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From a relatively inexperienced guy (me), here's my thoughts:
-what kind of rca cable is it? If it is not twisted pair, get one that is
-double check the ground on the stereo itself
Hmm... IF those don't pan out, then maybe try this- pull the stereo out of the dash, and get another RCA and run it straight to the amp right over the seats, just for test purposes. See if you get interference in that scenario. If you do, then you've ruled out bad cables, and you've ruled out something weird with your currently chosen route. It doesn't get you a solution, but it might tell us more.
Then again, somebody will probably have much better advice than me.
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