ECM problem or air flow sensor?

When the car reaches about 3lbs of boost it starts to cut out. Is that fuel cut by the ecm? The boost guage doesn't seem to operate very smoothly, sort of just jumps up all of a sudden. Someone told me it could be that the ecm for whatever reason can't keep track of the boost pressure and is cutting fuel or just "dumping". What is "just dumping". Has anyone ever had this same problem?

just dumping all the boost back out. ask the guys in the eclipse forums not 2000+forums

I forgot to mention that this is a 92 Talon.