Question about 2003 Chevrolet TrailBlazer
Don't really want to replace all the coil packs being that they are around 50 bucks each. What else can I check before throwing more money into it.
Pull the coil plugs when running. One at a time. If the engine gets worse the coil is good. No difference. Most likely the coil is bad. To check it again, swap it with another. Pull the plug on the suspected bad one. If it gets worse, look to wiring at the one that was no deference. Check for power to the plug.
Posted on Dec 23, 2016
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Posted on Jan 02, 2017
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i would suspect either the coil pack or the leads ,also make sure spark plugs are set to 25 th as too wider gap could cause this problem as well
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