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I've Sentra 2002 1.8 gxe when it's cold it doesn't starts but it dies quickly till several attempts it starts and engine idling hard then after 20-30mins it runs fine

the same thing happens when i drive with high speed like if something has come cold i replaced the O2 sensor but still have the same problem.
when i pour hot water on the fuel rail it start better.. please someone help me with this problem it drives me mad:mad:
 

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Do you have any MIL or got the engine (DTC) codes?
Have the throttle body cleaned, injectors verified, spark plugs changed (verify as well the coils) and fuel pressure checked. Bring the car to the dealer to verify the recalls. They could also tell you the DTC and give you an idea on what they will fix (probably they told you that the O2 sensors were malfunctionning) Now they will tell you that the MAF is malfunctionning (which was my problem).
Good Luck
 
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