Love my recently acquired Turbo S! Have found only one "wink" so far and looking for a diagnosis or direction of investigation, betting that just about everything that can happen to these cars has happened to someone on this list

Twice now in my nearly one week of ownership, the motor has lost fire at 5000 rpm, on boost, after a long sustained pull without breathing the throttle. Revs fine to 6K+ otherwise, on boost with dramatic acceleration during upshifting and country road runs. After the motor cuts at 5K, it does not immediately restart as if fuel starved. As soon as it catches it is fine and shows no effect of the event.

Is the fuel pressure losing ground to demand? Vacuum glitch? Cycling valve appears to be out of play and waste gate is atmospheric. Previous owner had installed manual boost control, now removed except for some dead plumbing coming off the intercooler pipe.

I have a billet adjustable fuel pressure regulator on my NA and could easily swap for testing.

Thoughts?

 

Check plugs and/or coil, coil wire.