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my 2004 cadillac deville has code po307,i have changed the entire bank of coil packs,replaced intake manifold gaskets,spark plugs,but still have this darn code and car runs but runs rough.

Vehicle: 2004 cadillac deville,4.6l y code

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Hi there,

I would do a compression check on cylinder 7. Its possible there is something wrong inside the engine causing the code. A bad valve or compression rings could be causing the misfire. Take the compression on that cylinder and with a couple of the others for comparison.

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