I have a 2000 M Coupe with an Active Autowerks intercooled OBD2 Stage 2 turbocharger system that will sometimes 'buck' under boost... usually when I back off the throttle to shift...ideas?

I've also been getting a code reading on misfires. Nick at Technique Tuning has software that he says should eliminate the problem. Is anyone running Nick's sftware?

Thanks much,