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2004 CHEVY TRAILBLAZER 4.2 LTR CHANGED PLUGS, COIL PACKS ARE GOOD, GOOD AIR FILTER, RUNS SMOOTH AT IDLE, BUT WHEN PUT INTO DRIVE RUNS ROUGH, AND STARTS TO STALL OUT HELP PLS
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You have two coils on this engine. Test each wire for spark with the engine running. You'll find at least one wire not sparking. replace the coil that has the wire that's not sparking.
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