Full throttle, car bucks, boost drops?????Cant figure it out.

[dookie]

full throttle car starts to hesitate/buck, boost drops from 15psi to 10psi.
maybe fuel cut? It has new spark plugs (ngk gapped.028) spark plug wires, walbro 255 fuel pump (stock 440 injectors) No boost leaks. Please help

 

[frontdriver]

You sure there's no boost leaks? Boost will drop a lot more than 5 psi when you hit fuel cut. Did you pressurize intake with at least 15 psi to check for leaks? If I were you I'd check for boost leaks again.

 

[dookie]

yeah i'll check it again but Im oulling my hair out....I'm about 3seconds away from trading it in on a mini cooper s!

 

[DSMSPOON]

mine did that too and noticed that my exhuast manifold screws were coming out...tightened those up and bam no more surges...

 

[dookie]

Well maybe mine is sucking in air at the exhaust manifold. Its cracked at the flange( sounds like a vw bug when its cold) Waiting to replace it when I have $$$ for a new turbo. Thanks for the input.