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  #1  
Old 07-30-2000, 08:38 AM
JML JML is offline
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Join Date: Dec 1999
Location: The Jersey Shore
Posts: 415
I have a 2000 GMC 3500, when it is in drive and i am sitting at a light it idles rough and the rpms go up and down. I have an appt. at the dealer on wednesday, I was just wondering what this is from and can I fix it myself? thanks<p>joe
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  #2  
Old 07-30-2000, 09:50 AM
bdemir bdemir is offline
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Join Date: Dec 1999
Location: metro detroit michigan (motor city)
Posts: 610
Im not an expert on cars but try changing the gas brand that you use and use the highest octane mobil along with a really good fuel additive. See if it does the trick. There is a brand called bradahl or sounds like that . I just put some in last night and it took out the pinging but yours is a new truck so im just guessing it might be it.<p><br>Always use high octane gas from a mobil staion your motors run better and dont use the gas from cheap stations like speedy or total.
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  #3  
Old 07-30-2000, 07:28 PM
plowking35 plowking35 is offline
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Join Date: Dec 1999
Location: S.E. CT
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Is it a gas or diesel?<br>If its a diesel, then it could be a variety of things from algea in the tank and lines, to a bad filter, or injector pump, and fuel solenoid driver.<br>Dino<p>----------<br> Professional Ice and Snow Management <br>Products:Services:Equipment www.sima.org
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  #4  
Old 07-30-2000, 07:35 PM
Evan528 Evan528 is offline
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Join Date: Jan 2000
Location: Montgomery County, PA.
Posts: 2,144
the truck has a warranty so there is no point in messing with it yourself!
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  #5  
Old 07-30-2000, 10:28 PM
Alan Alan is offline
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Join Date: Mar 2000
Location: NW Vermont (Milton)
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No magic in octane, and no point in buying more than your engine requires. I'd bet on an intermittent vacuum leak.

[Edited by Alan on 08-04-2000 at 10:59 PM]
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