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Q: 0306 trouble code on 2002 Jeep Liberty

my 2002 jeep liberty, gas mileage has been low 15-16 mpg, had radiator replaced in july. Heater does not get warm enough unless driven for extended periods of time. check engine light flashes, seems to have lost power because it drives sluggishly, exhaust smells funny and once it blew out a small puff of black smoke. I have not driven since I got check engine light.
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