After you've looked at grounds, the next places to look are alternator noise and ignition noise. Suppressor capacitors can be had at Rad Shack-they're reasonably cheap. Install one on the alternator and see if it makes a difference. Ditto for the ignition system. Lastly-are you using resistor-style spark plugs? If all else fails, power line noise suppression kits can be installed to clean up the 13 volts going to your radio.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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