2003 4.2 trailblazer

Asked by Twanw1000 Jan 13, 2021 at 05:52 PM about the 2003 Chevrolet Trailblazer LS RWD

Question type: Maintenance & Repair

03 trailblazer runs rough when you hit a
grade barely will pull changed map iat,
clutch fan, throttle body, air filter plugs gas
cap fuel regulator fuel filter fuel pump
pressure good cat is good obd says o2
sensors are good it just runs rich reset pcm
stft . 0 to . 3 at idle lyft is . O2 at idle barley
give it throttle load goes to 100 percent on
level ground it runs good hit a grade and it
will not take fuel beyond idle tranny is fine
no slip in drivetrain any ideas I'm out

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