so i bought this wrx and when i got it it had a bad motor dead cylinder it also cut out at 4000 rpms, so i got a used motor with 47000 miles at 180 psi for compression, installed it and put a new clutch and everything worked great started up fine, but it still cuts out, when going in any gear i can go to 7000 rpms if i dont hit any boost and stay in vacuum but right when i hit boost it cuts out at 4000rpm. so is that a tune? im going to try to flash the ecu and see what that does! any advice will be great.
----only mods are
-turbo smart boost controller set at 1 bar- stock psi