I have read about rca cables carring engine noises how does this happen and what can fix it?
that and are your RCA's running down the same side as you power wire, i have had cars were ppl installed there own stereo system have the rcas carry power thru them because they were touching the power, check all connections and also the RCA's might be old or bad so you may need to change them out
just riding around in the 4 door cav
The more you pay the better SHIELDING you will get, wich in turn, you get a better signal hence better audio quality. You will also be getting better ground at the connections.
you snooze you lose!
keep working, millions on welfare depend on you!