Some type of intermittent cut but not fuel cut

[4 n Toy]

I'm really stumped on this one. I searched until I was blue in my face and it seems that I cannot find a thread with a similar problem occurs. When I was running my big Evo 3 16g, I had no problems. Then I decided that I wanted to go bigger and bought a t3/t4 50trim turbo kit from AMS and but a set of hks 264/264 in as well. Once I had everything installed there wasn't any problems. I started having this problem about 2 months ago where if the car only builds around 10psi of boost its fine but anything over that it cuts like like mad. The more boost I run the lower in the rpm range it cuts. I pretty sure that its not fuel cutting because I was running the 680cc's and the dsmchip with the big evo 3 16g and it ran fine with no fuel cut. I changed my spark plugs cause I had a gap of about 1.2mm and it seem to help out a little bit. Since that it cuts around 4500rpmish where before it was cutting 3000-4000 on about 14-15psi. On the way home today (with newly installed COP), the car cut on the freeway which is only about 1km from where I work. But about 8km from work when I stepped on it again, it pulled right up to about 5500rpm then I had to let off cause i gained on the car in front of me too quickly. I was hoping that some of you guys might have some ideas as to where I should start.

Im thinking that its ignition related cause it happens some times but not others. However, I don't think that its possible but could I be blowing out my spark with COP and on only a 50trim? I'm not running a MSD box and my profile is up todate. Thanks for any help you guys can offer.

 

[Karma]

Does it cut out completly? Or just sputter?

 

[4 n Toy]

Depending on the day, if its fairly cool out it will cut out. If its warmer it won't cut as bad. I just thought about it now I haven't done a boost leak test with the new setup. I'm going to try that unless you have some other suggestions?

Thanks