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Acceleration issues

Tiny
11EKOHOR
  • MEMBER
  • 1997 CHEVROLET CHEYENNE
  • 198,000 MILES
My 1997 chevy cheyenne 4.3. Is having problems accelerating. It is a manual transmission and it doesnt accelerate well when its cold. It does seem like when I get the rpms way up before releasing the clutch it will work fine. It has been giving me 174 and 171 codes saying its running too lean in both banks. IT is also giving me an 02 sensor code. I have tried fixing the fuel system multiple times. Replaced fule pump, throtel positioning sensor, fule filter. And I am stumped, I would love some feedback. Thanks
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Thursday, June 2nd, 2011 AT 5:05 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Lean fuel condition could be caused by one of the following below:

1. Vacuum leaks
2. EGR and PCV valve.
3. Low fuel pressure.
4. Dirty fuel injectors.
5. Mass Air Flow Sensor.
6. Oxygen Sensor.
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Friday, June 3rd, 2011 AT 10:23 PM

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