rough idle of 2000 3500

[JML]

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

 

[bdemir]

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.

 

[plowking35]

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

 

[Evan528]

the truck has a warranty so there is no point in messing with it yourself!

 

[Alan]

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]