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Get a code reader or borrow one from autozone or like places. You will likely have a check engine light on and that cylinder will be coded as "misfiring". The code reader will tell you which one.

You'll get a misfire On Board Diagnostic (OBD) code if one is bad. A misfire code is in the 3000's: P301 means # 1 is misfiring, P302 means #2, etc. The cylinders are numbered front to back starting on the passenger side:

4 8

3 7

2 6

1 5

(front of car)

What it would be a P0355?

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Q: How do you know what ignition coils are bad on 2004 Lincoln ls?
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