I am tuning a friends 2002 Z06 and he has a Magnacharger and a lighter Fidenza flywheel. At about 1700 rpm, there is a very slight miss, or more like a quick blip. The tuners say this is normal because of the lighter flywheel causing the engine to not be balanced correctly. YET, when it is cold and still in open loop, there is no miss. Any ideas where to start in the tuning process for this miss?