Isuzu Trooper Engine Misfire. I am trying to fix a problem with a '01 Trooper Limited 4WD. The vehicle has 75,000 miles and started to sound rather rough. My wife had the vehicle checked at a shop and was told the EGR valve was bad. I replaced the part as well as a new set of plugs, reset the OBD codes and the car runs a lot better. More @Wikipedia
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