fuel mixed with engine oil

1993 sentra, I got a problem with fuel getting into the engine oil and when the car reaches normal operating temperature losses power. What would that be??
Reply to
Tad
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something it telling the ECM to richen the mixture when it does not need to be .

Items to check

Coolant temp sensor Air flow meter oxygen sensor

when the car reaches normal operating temperature losses power. What would that be??

Reply to
NissTech

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