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Your 2002 trailblazer wont run properly after you changed the plugs What is wrong?
Wiki User
∙ 15y ago
If it ran fine before then you have 1 of 2 problems. One, the plugs were not gap to the correct distance as stated in the owners manual. Or two, the plugs may be defective. Easiest to replace them all again :( Buy a good brand such as NGK and avoid autolite brand plugs.
Wiki User
∙ 15y ago
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