help boost problem !!!!!

[That3000gt]

To start off have a 91 vr4 mods are
Fmic
Intake
Full exhaust
Boost mod
Egr delete
Hks bov

The problem is on full boost it will give one hard jerk like u hit a wall happens at say 4k rpmsi gapped my plugs down the 30 they were 40 and smelled gas and black this all happened when i put the fmic there bigger pipes then stock but had no problems on my other car
Things i think it is
Boost leak
Faulty fuel pump cause its also taking awhile for car to start
Boost solinoid faulty and spiking
Fuel filter clogged i did run it on e before and also sat lifted jacked up forawhile to do the fmic any help is aprrieated thanks

[Hard AttacK]

Fuel cut! Get a hotwired walbro in there. Or at least hotwire your fuel pump.

[That3000gt]

For sure? Can I just run a 255 walbro without having to buy bigger injecters and afc

[Hard AttacK]

Did you check for boost leaks? Do you have a boost gauge?

[That3000gt]

I did only leaks from manifold rail where all the vac lines connect pressure makes it all the way there

[Hard AttacK]

How bad or big is the leak? It doesn't really work that way.

[That3000gt]

Im not sure just leaks from the 3 nipples on the manifold from the hose i guess so much pressure forces it out there