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Q: Ignition Mis-Fire on 2003 Cadillac DeVille

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I have a mis-fire on my 3 and 7 cylinders. I know I have to change the coil pack, wondering if any one knew if these cylinders were together on back or front or are they on opposite sides.
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This engine is transverse. Which means it is positioned sideways (the front of the engine faces the passenger fender). The front bank of cylinders are the even numbers and the rear bank by the firewall are the odd numbers. More specifically thy are numbered 1, 3, 5 & 7 starting from the passenger side of the car. Also, Northstar engines have cylinder numbers stamped on the valve covers in most cases. Hope this helps.
I've change everything else except for coil pack. Plugs, Boots, Leaking Plenum Checked Intake manifold an d cleaned throttle body. That's why I'm thinking the coil pack is the problem.
Do you know of any way to troubleshoot Coil Pack. I've priced them out at OEM $300 & $325.
Did you try pricing them on the internet? I just replaced mine for 192 which included delivery cost. USAautoparts.com Delphi is the original or OEM company who makes these parts. I would use them.
Both are located on the rear bank. The actual configuration is as follows: cylinders 1 is at the rear left corner. then 3, then 5, and 7 is the last on the right end. ALL are in the rear. the even numbered cylinders are all up front. with 2 at the eft end then 4, 6, and finally 8 is on the right end. The front coil pack is easy to remove. The back bank is a bear. Also, there is a set pattern to use to re tighten the bolts as they also hold down the valve covers. Pick up a Haynes repair manual at any auto repair store. About 20 bucks.
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The 2003 should have a coil pack that mounts directly over the entire bank of sparkplugs. The module is part of the coil pack. Make sure you confirm the coil pack is bad. It cost way too much to make a mistake on this repair!
I've change everything else except for coil pack. Plugs, Boots, Leaking Plenum Checked Intake manifold an d cleaned throttle body. That's why I'm thinking the coil pack is the problem.
Do you know of any way to troubleshoot Coil Pack. I've priced them out at OEM $300 & $325.
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