Question about GMC Sierra 3500

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Service throttle light on

Motor starts ok but very sluggish up to 50 mph and then runs ok any help would be appreciated

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  • 159 Answers

Have throttle body serviced may need to be cleaned

Posted on Dec 28, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 34 Answers

SOURCE: car runs rouhg at 50 mph

o.k... question... when you punch it... does the car barely go... and the engine reve up? if you gently press the gas... does is act the way it's suppose to? if that's what you have... change out the fuel pressure regulator... and the fuel injector... see if that doesn't work for you... o.k... good luck to you

Posted on Oct 25, 2008

dennymulford
  • 1055 Answers

SOURCE: f150 floods when cold, runs sluggish when warm

at that many miles its do a timing set

Posted on Mar 05, 2009

  • 508 Answers

SOURCE: 1994 chevy c1500 4.3 lt v6...the truck cranks but runs with a hea

jumped time or burnt valve

Posted on Jul 01, 2009

  • 160 Answers

SOURCE: Jeep starts sluggish and then wants to die

It is most likely from that actually. You may need to adjust the air / fuel mixture after modding the intake. Sounds like its getting too much air.

Posted on Jul 17, 2009

  • 497 Answers

SOURCE: speedometer surging. actual speed 40 mph,

Its a loose connection on the speedo cable. its a b*tch to get to. I had the same problem on my truck, it would fluctuate in 5th gear on the highway. i spent the money and had a professional do it.

Posted on Aug 09, 2009

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