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Do coil packs for a 4.2 2003 Chevy trailblazer go in certain sequence?

Yes, the coil packs on a 2003 Chevy Trailblazer 4.2L engine need to be installed in a specific sequence. While there isn't a marked sequence on the packs themselves, the order is dictated by the engine's firing order.

You must consult a repair manual or a reliable online source (like a forum dedicated to Trailblazers) that shows the firing order for your specific 4.2L engine. The firing order determines which cylinder fires in what sequence, and therefore which coil pack needs to be connected to which spark plug wire.

Installing the coil packs incorrectly will result in a misfire, poor performance, and potentially damage to the engine. Don't attempt this repair without knowing the correct firing order.

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