Car shuddering when accelerating

[JamesSap]

Hi guys, last night I went for a drive with some mates, 5 people in the car, and the car began to shudder when I would accelerate from around 0-60 rather violently. I have changed nearly everything on this motor including every sensor besides knock sensors, coil packs, dfi, leads, plugs, fuel pump and filter, injectors, fpr, trans fluid and filter, diff, and every gasket besides the head gaskets. The strange thing is that once I dropped off the last passenger (just me and one other person left in the car at this point) I could not replicate the symptoms no matter how hard I tried. If anyone has any ideas it would be greatly appreciated. Thanks guys

 

[krusing]

Car is ?
V6
Super6
V8

Car would shudder -

When you accelerate violently?
or
When you violently accelerate?

Either way, with 5 people in the car is playing russian roulette.

With what your saying, get it scanned, if it was that bad, it sounds like it was missing on 1 or 2 cylinders, even tho you have replaced various pieces of hardware,

Possibly the fault could be some of the hardware is faulty,
(its known that some crappy cheap hardware is dumped in Aus and sold on eBay)
Possibly a VAC leak, as for when you accelerate hard.
Possibly the Centre Bearing is knacked.

When and Where did you source the parts?

What made you replace the parts ?
What issue did you have before the hardware replacement?