Penton said with the nature of these coils they cannot be accurately tested, you'd have to send them in to make sure everything is good. Are you sure both cylinders are cutting out? Is it noticeable more so on one cylinder? Heat, smoke, etc?
Things to check:
-Gapping of the moons around flywheel, you can use a business card to space around the flywheel.
-Timing
-Wires to coils are nice and tight, they need to be tight or they rattle loose at high RPMS
-Have plug wires on the correct side (as well as I've found that you should be running stock PVL non resistor caps)
-Ground adequate, I use a wire for each coil to the head.
-Plug Gapping 20 thou, B9egv plugs is what I run
Keep us updated, dont give up on the PVL.
Eric