Also check the intake manifold gasket and the plenum gasket. Common failure. I see it quite a bit at the shop. just spray some brake clean on both with the truck running and see if your idle changes on one or the other or both

Justin Morgan-Speed never killed anyone, it's the sudden stop at the end that'll get ya

1988 Toyota 1/2 ton
Solid front axle, locked fore and aft, 35's and 5.29s.