Tomorrow I'm going to spray a can of CRC GDI Intake valve & turbo cleaner into the intake, run some motor flush through it, then change the oil.
Completed all this today. Ran the CRC through the brake booster vacuum hose. After the oil change, I went for a half hour drive on the highway with O/D off, so the higher RPM would blow out any crud on the valves. I reused the motor flush from the truck in a Hyundai, right before I changed the oil in that.
Did I mention that I love the quiet cold starts with no lifter clatter. This completes the fix and the truck is running really well. The beast is back and ready for another 200K!
Thanks, all