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2001 Ford F-150 missing and hesitation

Tiny
LUVMYFORDALWAYS
  • MEMBER
  • 2001 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 158,000 MILES
My truck idles rough, and when applying gas pedal, it stutters and bucks, until I let off or get up to about 65 to 70 mph. Have pulled and cleaned all vacuum lines, no leaks found, cleaned MAF, and just replaced DPFE sensor. Still the same. Have codes 0301, 0304, 0171, 0401. Any help would greatly appreciated. Driving me nuts.
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Thursday, October 7th, 2010 AT 3:20 PM

2 Replies

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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Thursday, October 7th, 2010 AT 5:14 PM
Tiny
LUVMYFORDALWAYS
  • MEMBER
  • 1 POST
I replaced cop and plug on cylinder one and all is good as new now. Thanks
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Thursday, October 14th, 2010 AT 2:20 PM

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