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What are you using to power the PC???? It COULD be that if ur using a power inverter. It could be causing problems. Also what guage is ur Power and Ground????? ur ground shoule be AT LEAST eaqual, or more then ur power cable. you seem to know what ur doing (power to one side, RCA's to the other) but you know to ground to BARE THICK metal, Something like a Seatbelt bolt with the paint ground away.
Do you have any neons? also, does the Engine noise change pitch with the RPM of the car??????? it also could be ur headphone jack, what kind of sound card are you using? Is it embeded???? I would try to find something with RCA outputs. Ive hard problems with headphone to RCA converters, It never sounded right.
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