Do you guys back off the locknut a ways down the screw, and then turn the screw by hand from its tip underneath? I'm having a heck of a time getting two 10mm wrenches down there.
It isn't in the easiest place to get to, but using a 10mm wrench from the top is how I do it. Having a helper to hold the throttle full forward would make it a bit easier. The bolt goes up to increase idle. A little bit of adjustment goes a long way.
97 3500, 2 WD, G56, slightly bombed, 1.3 million miles with un-additized diesel fuel. Started the second million on 8/24/13
If you are lucky enough to be in Texas, you are lucky enough.