Your first port of call should be your revo dealer. They may have come across the issue before and know an easy fix, or there may have been a sw update issued by revo since you had it done. Some data logging needs to be done to determine if it's air, fuel or spark causing the mishap (or a combination of them) then further logging to determine which sensor, pipe, wire or whatever is the underlying problem.
Maybe unrelated but has anyone also noticed that from a cold start the remap does not seem to work 100%? some kind of limits when cold i take it?? 
From a cold start the ecu will be adding fuel anyway, but more importantly you shouldn't even be using your right foot enough to notice the remap until the temp display has been at 90 for a few minutes. Not warming up or cooling down the engine properly is a surefire way to destroy your turbo.. especially with a remapped car.
I do this sort of thing for a living so if anyone in the midlands area needs something checking over just give me a shout
