Boost cut problem

[Bennyr32gtst]

Hi guys have an r32 gtst rb20det

Having a problem with my car was driving fine up until last week when I went to throttle past 6000rpm it would start backfiring and popping and not letting boost past I tried to see if any vacuum lines from the boost controller are cracked or torn and they weren't no piping has come off and can't figure out the problem if anyone has any idea where to start would be much appreciated!!! Thanks guys!

 

Mod list is gt3582 turbo

Turbo boost tap

Front mount intercooler

Farina racers ecu

And yellow jacket coils

[niZmO_Man]

Check the spark plugs. Gap them down to 0.6mm

[Bennyr32gtst]

Oh ok yeah they are gapped to 0.8 at the moment thanks man il give it a try

[Bennyr32gtst]

Changed spark plugs and disconnected boost controller to standard back to wastegate and still have the same problem doesn't happen in neutral only when in gear at about 6000rpm complete boost cut and a lot of pipping any other info would help@niZmO_man