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What would cause engine bucking?

Tiny
MJB1222
  • MEMBER
  • 1999 FORD EXPLORER
  • 196,000 MILES
I have a 1999 Ford Explorer Limited AWD 5.0L. When I have more than two electrical components turned on at the same time (i.E: headlights, heater blower, and rear defrosters) the car will start to 'buck' during driving. I notice a slight drop in rpm when it bucks as well. As soon as I turn off one component, the bucking goes away. I had the alternator and battery tested and they both tested great. Any ideas as to what could be wrong?
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Thursday, December 15th, 2011 AT 7:14 PM

3 Replies

Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Have you checked voltage at battery when vehicle is running and you turn on the items?
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Thursday, December 15th, 2011 AT 8:18 PM
Tiny
MJB1222
  • MEMBER
  • 2 POSTS
Yes, I had that tested after the alternator and battery were tested.
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Thursday, December 15th, 2011 AT 10:54 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
How old are spark plugs?
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Saturday, December 17th, 2011 AT 2:53 AM

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