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If checking your grounds doesn't help, here's some other ideas:
Does your amplifier ground your RCA input shields, and are the two shields (between right and left on your amp) continuous? If they are, you might have a ground loop which is picking up engine noise. Try pulling our your RCAs so the tip is touching but the shield is disconnected. If you have less noise like that, you might have to make your own RCA leads with a common ground.
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