Fuel System Issues?

[samneil2000]

After cleaning the MAF sensor, tightening a hose clamp, and driving the vx around for a few days the bucking has returned. Guess I will be replacing the FPR next.

Sorry you're having so much trouble. I hope the fpr is your problem. Make sure you have or make the short allen wrench. It makes the job way easier. More or less impossible without it...

[Y33TREKker]

Something else occurred to me given the fact that the symptoms seem to reappear after you've been driving for awhile, and that is whether your u-joints could be involved. I don't know how likely that is, because as much driving as you've done while the problem has been happening, you'd think that if a u-joint was seizing due to lack of lubrication, it would have just totally let go and broken by now, but then again, they're built solidly for a reason so...???

Easy enough to stick some grease in them anyway, and unless everythings' been lubed in the last few months, it probably wouldn't hurt regardless.

Sounds like quite a few possible culprits have been eliminated though, so with a little more patience, it surely won't be that much longer before you get it figured out.