It has the check engine light on.

Tiny
CHUCK46
  • MEMBER
  • 1999 FORD F-150
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 250,000 MILES
My ford f-150 4.2 sputters and misfires when I step on the gas? What may be the problem?
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Saturday, December 18th, 2010 AT 12:42 AM

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Tiny
JACOBANDNICKOLAS
  • EXPERT
If the vehicle hasn't been tuned for some time, you may want to check wires and plugs. Also, check for vacuum leaks. Make sure fuel pressure is within specifications. There is a how to check fuel pressure on our home page under the DIY section. Since it is missing when you put a load in it, I feel it is ignition related, but can't be sure until fuel pressure is checked.
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Thursday, January 13th, 2011 AT 8:17 PM

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