2006 Nissan Altima misfire after new plug and coil

Maintenance/Repairs
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1

I have a miss fire in spark plug #1 I have changed the plug and coil and I still have a miss fire???

2

Run a compression check of all the cylinders. You may find #1 is low.

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3

A dirty/defective fuel injector can also cause a misfire.

Tester