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there on top of the motor under the air box and they have coils over them with one bolt and fins on the coils.

I thought there were two bolts on each coil pack?

Anyway the box that says "Vortec 4200" is called the resonator box and covers the coils. It is important to remember that there is a fuel pressure vacuum hose attached near the front drivers side of it and the PCV valve hose connects on the bottom.

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Q: Where are the spark plugs located on an 03 Trailblazer?
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