Question about GMC Sierra 3500
Motor starts ok but very sluggish up to 50 mph and then runs ok any help would be appreciated
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Posted on Jan 02, 2017
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
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
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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