5.9 started idling quite high

The "White Whale," 97 Ram 1500, 5.9, 2WD, suddently started idling quite high. I pinched the booster and pcv hoses, to no effect. It's not burning oil, but I'm thinking "it probably" is the bottom plate on the intake?

I haven't done anything, EG that should affect the mechanical throttle linkage