Yes -- For me it was more of a user error. I thought I would be able to give the truck a fast rev once it was started and it would still fast-idle. This does not work. As long as I push the throttle to the floor (to set the fast idle) before I start it, it seems to work. If I rev it fast or accelerate hard right away, the choke will open all the way up again instead of ride on the fast idle cam.
It's a confusing system but I believe mine is working the way that it should.