another 5k question

[JPL96GST]

I have searched for 3 days on here about 5k bucking/misfire.....I just replaced my saprk plugs with bpr6's proper gaps.....but now when i hit 5k at WOT it feels like i just left my engine in the road behind me, i have a 14b running spike to 15psi and back to 14 on a aftermarket boost gauge...i have done this without fuel cut for 6-8 months...it feels like fuel cut but what makes me wonder is that after it bucks HARD it then continues up the rpm range however with not as much power?

I have magnacore wires on there now that are 18months old and look great.

 

[JPL96GST]

UPDATE....So i went and pulled my wires and put them back on just to make sure....i drove for ###### 10min and the problem was gone....now today it is back again.....and the engine still pulls after the buck

 

[JPL96GST]

OK fixed the problem the thing is I just want ot understand why this made it happen for knowledge purpose i guess ...

So my car was acting like it would cut out(misfire), stutter...whatever you want to call it but continued to pull after doing so....

I ran a boost leak test and it held pressure great!....but my adapter for my cone filter was cracked so after plastic welding it back together....i also went through and tightened my resurc tube, and turbo coupler which apeared loose....

So after that it ran great pulled smoothly to redline.....So was it getting more air than meatered which caused it to hit fuel cut? or what? because it diffenitley didnt feel like fuel cut?