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4.6 Liter Misfire code

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I have a 2004 SRX 4.6 Liter. There is a terrible misfire and check engine light flashes. This seems to go away about 2000rpm or when car is driven while still cold. The auto parts store said the code was a random misfire on 7 and the engine was running lean. My gas mileage reduced to under 14mpg since this started occurring. Can anyone give me a possible solution or somewhere to start? Thanks. Paul

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Changed all plugs. No difference.



Can you go back by the parts store and let them pull the codes again??

This time.. write down ALL the codes that show on the code reader.

It could be so many different things...

We really need the codes to be able to have a good starting point om diagnosis.

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