2002 Subaru WRX engine revving

2002 WRX to show how it stumbles when it tries to settle back into an idle after being revved up. I just bought the car and i am trying to get it to run right.
Hybrid engine 2.5Sti block, 2.0L heads, swap done about 15k miles ago.
750CC injectors
OEM Sti turbocharger
Reflash tuned by PRE in Portland, OR
Plugs look good and are gapped correctly
engine has great compression in all cylinders
Have been told it is an air-leak in the induction system, but I have pressure tested it with my air compressor (to 10psi) and it is holding very well.
This stumble occasionally leads to misfire codes by the ECU.
Gets a lot worse when driving, especially in stop/go traffic. sometimes it wont idle at all and car has to be throttled to keep it alive.
Help me fix this problem!

[@lotusking2006]

having same prob here multiple misfire and catalyst bank 2 error . 02 wrx

[@ts-vu3dd]

HELP!!!!! I notice you still post videos!!! I have the exact same problem on my 02 wrx I have an 03 wrx ecu to make sure the phantom misfires weren’t gonna be a problem but I cannot solve it

[@Sookigarage]

The injectors were garbage. They were modified by a previous owner by remove the nozzle cap. Fuel was not atomizing. New injectors fixed it.

[@fastflat4]

this is why you dont buy cars with that much work done. The problems are endless. check your timing belt. and timing. thats my guess. I have a ej257 swapped in my 05 wrx.

[@warzonefactory]

what about your M.A.F sensor? doesnt look like you putt it back in when you putt the AEM intake in i did that on my car and had the same issue, when i putt the M.A.F sensor back in it went back to idle fine