is this what spark blow out looks like ?

[68_GT]

watch the tach about 5k. If it wasn't a digital tach I don't know if you would see it on the tach like this shows

The speedo appears to be climing normally, but I can still feel the hesitation and occasionally feel it slightly bogging down.
http://s109.photobucket.com/user/68_GT/media/car%20stuff/1968%20GT%20Mustang/19FC6F4D-031E-4405-91DB-0B76B1A4C75B-167-00000004868A8721_zps01674a22.mp4.html

[68_GT]

Talked to Anthony at LMS he sent me an updated Stage 3 tune and suggested I close my plug gaps to .30.

the tune still not available but it's supposed to carry the boost to the shift point versus falling off at 5k. Should be fun when it's ready I always wondered why my SHO seemed to run out of breath in the upper rpm's I thoguht it was becasue the turbos are small.

[crash712us]

What are we supposed seeing here? The engine note I hear seems normal and not interrupted. I see a LCD tach that appears stutter between 5 and 6. What else is there that makes you think you may have spark blow out?

[68_GT]

What are we supposed seeing here? The engine note I hear seems normal and not interrupted. I see a LCD tach that appears stutter between 5 and 6. What else is there that makes you think you may have spark blow out?

as stated above the stutter between 5k and 6k that you see is what I can also feel despite it accelerating and sounding otherwise normal.

[JMR76]

Try gapping plugs .030 first and see how that works.  It helped mine.

[jimmyducati]

I would check and make sure you have the updated plugs too, just read a thread from a guy saying his '13 SHO had old plugs. Also, make sure the knock sensor wire on the front of the drivers side head isn't chaffing against the block, its pretty obvious if it is. Also, if you pull the plugs, I would make a stop by the dealer and pick up a few of the rubber insulators that attach to the bottom of the coil and hold the spring that makes the connection between the coil and spark plug, a couple of mine were fused to the spark plug and had to be pulled off, which destroyed them.