Partial throttle jerking and shutting off...Banging my head on this subject

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  We have a 99 Avant DBC with a 2L stroker that Bob built for us.  We are running a GT30 turbo.  We are running 22psi daily, but have a issue with part throttle jerk.  While accelerating everything is fine.  But, if you are driving normal and merge into traffic and are adjusting your speed(not lifting off the throttle) if blow off the boost and causes a jerk.  Sometimes it is worst than others.
  We were running a TurboX RFL BOV, but since this weekend, it has been changed to a Forge RS DV.  I was thinking it would solve the problem.  No luck.
 

Any insight to fix this jerking.

Also, another problem has come up since I installed the DV....the car shuts off.  WTF?  Thought this was the set up the car needed?

Any input would be great.

Thanks for the time,
Mike

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Fixed the shutting off problem.  The vacuum from the motor was pulling the DV open.  So, I tightened the DV spring.  Think it fixed it.
Just an FYI...The DV has made the car faster.  Wow.  Probly b/c it's not running rich in between shifts?

Jerking issue...I think it's due to the MBC.  I'm going to put another one in this weekend.