IAC maybe?

[wrangler94]

Sorry to revive a long dead thread, but this upcoming weekend not only am I replacing the door hing pins for the second time this year, because the Dorman ones fell apart and the door is worse now than before I fixed it, but I'm trying to diagnose and fix a high idle, bad gas mileage, and sometimes stumbling and hesitation issue in my 92 3500 with a 5.7. I get, and can find an AC delco IAC valve if that turns out to be it, and I'll check the brake booster too, but the coolant sensor in the intake, is it the same one as the one for the cluster? just a second one? auto parts store only shows one for the truck. guage doesn't work either, and gonna check for correct thermostat as well this weekend just because.