Re: Air throttle - 8.3 Cummins
The fast idle on my Thomas brings the idle up to about 1200 RPM. Seems like I adjusted this when I installed the cruise control. I think it has a set screw in the back that you loosen a jam nut, then turn the screw in or out to make the adjustment. Can't remember which way to slow it down. Make sure it is not a linkage issue, sounds almost like someone may have assembled it incorrectly. Hope this helps. Doug@8000'
"What!?! You bought ANOTHER bus!!!"