7age 20v BT poping at 6k RMPS

[v33sonata]

So after the STA issue has been fixed I started fine tuning the engine. I noticed she was running lean. As im looking for a fuel rail adapter I figures I would run my FPR behind the stock one and pull off the vacuum hose to the stock one as well. I bumped the fuel pressure to 44psi and she is runing much more smoothly and much better. However I have a missfire under 2k and now she isnt reving past 6500rpms. Also sounds like she is hitting a rev limiter. What do you guys suggest is the issue?

[v33sonata]

ps i am also getting a little pop during deceleration

[v33sonata]

I figured out that when I reset the ECU it works fine again for about 30mins or so. But its not throwing any codes........>?