Coil pack spark plug

Asked by Guru95JP6Z Jan 21, 2021 at 03:54 PM about the 2003 Chevrolet Trailblazer LS 4WD

Question type: Maintenance & Repair

03 trailblazer is running bad so i checked the
plug's and found a broken plug and changed
it and now its running really rough

1 Answer
11,755

FJ4072 answered 4 years ago

Any check engine light? Double check the coils seated on the plugs, very easy to not get it right, been there. Feel and listen for the click. Make sure your resonator hose was plugged back in too, or make sure the brake booster vacuum hose didn't get knocked off.

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