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Possible causes for rough acceleration from dead stop and surging at highway speeds

Tiny
XAVIERSERRANO70
  • MEMBER
  • 2002 FORD F-150
  • 150,000 MILES
Ford f-150 4x4 with 4.6 and automatic trans. Truck has sat for 2 months. Ran fine before. Experiencing rough acceleration from dead stop, then smooths out. Also surges at highway speeds.
Sunday, October 16th, 2011 AT 10:30 PM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would start with basics. Replace the plugs and add some injector cleaner to the tank. Fresh gas may help as well.

Roy
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Sunday, October 16th, 2011 AT 10:32 PM
Tiny
XAVIERSERRANO70
  • MEMBER
  • 4 POSTS
Has fresh gas. Wouldnt bad plugs make the engine run rough constantly? I will replace plugs and try the injector cleaner as you suggested. Thank you for responding so quickly.
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Sunday, October 16th, 2011 AT 10:41 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Not constantly, just occasionally. I would start with basics before looking into other stuff.

Roy
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Sunday, October 16th, 2011 AT 10:50 PM
Tiny
XAVIERSERRANO70
  • MEMBER
  • 4 POSTS
Replaced spark plugs and air filter, also checked all vacuum lines. Truck still running the same. What else do you suggest. Thanks
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Thursday, October 20th, 2011 AT 10:47 PM
Tiny
XAVIERSERRANO70
  • MEMBER
  • 4 POSTS
Replaced spark plugs and checked all vacuum lines. I also replaced the air filter. Truck still running the same. What else do you suggest? Thanks
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Saturday, October 22nd, 2011 AT 1:05 AM

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