Question about 1999 Chevrolet Express

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1997 discovery runs good until the engine warms up

Engine is cood runs great, it does have a slight knock in engine
but it still runs good when the engine is cold.After about 15 min.
of driving,it starts missing, loses power,will only go about 25 mph
push down on the pedal and it only sputers out.

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HAVE THE CATALYTIC CONVERTER CHECKED FOR BEING PLUGGED.

Posted on Jul 12, 2009

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