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07 dodge nitro rt 4.0 getting code p0171. Have already checked

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for vacuum leaks and replaced...
07 dodge nitro rt 4.0 getting code p0171. Have already checked for vacuum leaks and replaced MAP sensor. Acts like a misfire and when at stop lights my chk eng light flashes and interior beep sound. Took it home. Sat for 4 days. Then I put that map sensor in and reset the computer. Drove for 4 days and the light came bk on and acts like its missing again. Or that its flooding out because of a false lean code. I lost 4mpg in 15 miles! I don't think its the o2 sensors but I could be wrong. What should I do?
Submitted: 2 years ago.Category: Dodge
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Customer reply replied 2 years ago
During the 4 days of driving after putting in the Map sensor it drove great. So don't think it could be a coil. Plus when I get the codes on my dash board where the mileage is at by turning ignition on and off 3 times I never get his fire codes even though the chk eng light is flashing...
Answered in 9 hours by:
5/30/2015
Dodge Mechanic: Ron, ASE Certified Technician replied 2 years ago
Ron
Ron, ASE Certified Technician
Category: Dodge
Satisfied Customers: 36,370
Experience: ASE Certs
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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here
The check engine light flashing means the computer is seeing a direct engine misfire and in most cases providing you are sure there are no vacuum leaks is usually caused by a failing spark plug and or coil. In some cases the computer will not always set and store any engine misfire codes. You can usually take a look at the misfire monitor count on your scan tool and see the effected cylinder. Is you scanner able to read the misfire count?
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