You're right, vibrate was a poor choice of words. Anyway, I got it all buttoned up this evening and when I started it up, it ran like absolute crap, for the first few minutes... knocking sounds and all. I thought all was lost, then it smoothed out and began to run like the truck I knew. I guess the new hydraulic lifters took a while to prime and maybe the valves are seating a bit better now. 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.