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I have a 1996 Ciera 3.1L that reports P0171 as a code. It…

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I have a 1996 Ciera...
I have a 1996 Ciera 3.1L that reports P0171 as a code. It also hunts at idle (faster-slower) unless you hold a small amount of throttle. The code sometimes disappears for a while but always comes back. One time it also reported P0300 misfire. I have cleaned the MAS, checked the IAT (reads 2400 ohms at 65 degrees), checked the level from the oxygen sensor (reports from .350 to .450 on the OBDII reader). I have noticed a slight decrease in fuel economy but that might be because of holding a slight throttle at traffic lights. What have I missed / what to check next?
Submitted: 2 years ago.Category: Oldsmobile
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Answered in 1 hour by:
2/2/2016
Oldsmobile Mechanic: Amedee, Oldsmobile Technician replied 2 years ago
Amedee
Amedee, Oldsmobile Technician
Category: Oldsmobile
Satisfied Customers: 28,342
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
Verified

Hello and welcome! My name is ***** ***** I can assist you with your question. This condition is caused by an air or a vacuum leak. Look close by the intake and throttle body gaskets as well as all of the vacuum hoses/lines. I bet you will find a leak. Just be sure that the fuel pressure regulator is not leaking.

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