shake/shutter/wobble under accelerated load.

[wireless]

well, i have a strange situation going on, it started yesterday, under acceleration as in speeding up on the freeway to pass or move over the front end feels as if it is shuttering/shaking/wobbling, if i stay at a steady cruizing speed it is smooth or if braking it is smooth, it only shutters under accelerated load, tranny temps are normal, i put it in the air (with a jack) checked axleshafts and all front suspension components everything looks great, my drivers side inner cv boot is spitting grease but its not split, i did do a full reprogram of my pcm late last week, and i may program back to stock just to check. and the only other thing i did recently was tighten all my header bolts. has anybody else experienced this? any ideas of what to look for?

[91parkave]

have you performed a case learn yet?