My 96 2wd w/auto has a slight shudder at idle.
When idling you can feel it- sorta the feeling a loose wheel has when spun on an axle- it is harmonic... phrumm, phrumm, phrummm. Not a constant shudder, but regular.

Engine and truck seem to run well- it only has 82k miles on it.

I heard somewhere these trucks had a problem with fly wheels cracking.

Anyone else ever heard of or experiences this?