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1999 Ford F-150 hesitates

Tiny
DANGAR64
  • MEMBER
  • 1999 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 131,000 MILES
My f150 hesitates while stoped at a red light. I press the gas peddle and hesitates to go the takes of. If I put it in nuetral or park it does not hesitate. Also at high speed (70 mph) it jerks when going up a hill I have changed the following. Spark plugs, gas filter, injectors, idle air control valve, egr, also clean egr ports in the throttle boby. Today I had a p0420. Please help
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Wednesday, February 3rd, 2010 AT 5:46 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
PO420 - Catalyst System Efficiency Below Threshold (Bank 1)

Have you replaced any of the O2 sensors?
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Wednesday, February 3rd, 2010 AT 8:14 PM
Tiny
DANGAR64
  • MEMBER
  • 2 POSTS
No, I have not replaced the O2 sensors.
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Thursday, February 4th, 2010 AT 7:14 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
I would recommend having that checked or there could be a problem with the converter.
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Thursday, February 4th, 2010 AT 7:43 AM

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