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P030X codes 850 1996

I've been getting occasional P030X codes which are cylinder misfires. Doesn't happen too often, but if I clear them, they come back in a week or two. Tunup stuff is all done. New Plugs, air filter, Distributor rotor and cap. Flame trap is clean, Throttle body is clean too. Otherwise the car runs just fine. 47K mi. Any suggestions on where to look?

Tnx,
Dave







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