the issue is the 1st clown that tuned it....obviously had no idea what he was doing....he should stick to replacing mufflers on Falcodores!
If I could get it on a dyno I reckon I could get it running better myself......half the issue is putting in the correct injector corrections & latencys followed by the correct values for the Nismo AFM's......that would get me 1/2 way there after setting up the idle proceedure from initialization properly which he didn't do. It's idling too high, constantly hunting, rich AFR's and possibly too much timing.