Early 99 shaking on cruise, 2200rpm and up.
Interesting little issue here. Started a week ago driving into a stiff wind on interstate. 75 mph, 22-2300 rpm. When to pick up to 80mph and reset cruise, and the truck started shaking like hell, like fuel was cutting or something. Take out of cruise and just run throttle with foot and all is well. Yesterday, pulling 9000 pounds or so, same deal. Weird thing is, times it does it, times it works fine. Obviously with the load, the shaking was very noticeable. Truck runs great and all.
Forgot to add, this will do this in either my eco. or daily tune.