Jet,
The driveability portion of the tune is pretty much done.
Backfiring under load: Gone. Could not be solved with a MAF-only tune like you had previously. You needed the VVE tables to cover a lean spot between 2000-3000 rpm. The VVE tables had to be extensively modified then re-engaged. You now have both VVE tables and MAF working together up until 4000 rpm. Just the way GM had it from the factory.
Hanging idle: Gone. Took lots of massaging. The FAST 102 and 102mm TB pose their own set of challenges for tuners, but yours is nice now.
Bucking and surging: Gone above 1400 rpm and very slight below that. You can crawl in 1st gear with the a/c on and cruise in 6th gear at 1200 rpm and not have any issues.
A few mechanical issues needed to be addressed. The PCV/catch can was not set up properly, but is now. The FAST intake had very loose bolts which might have given a little bit of a vacuum leak. It's all torqued down now.
Let me know if you want to pick it up now or wait until after the Katech tensioner and new belt is installed.
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2013 Corvette Grand Sport A6 Forged 416, Greg Good ported TFS 255 LS3 heads, ECS NOVI 1500 blower, 222/242 .629/.604 121LSA EPS cam, ARH 1 7/8" headers, NPP exhaust, 747rwhp/709rwtq on 93 octane, no meth, w/stock street manners.
2014 GMC Yukon XL Denali, Air Raid MIT, tuned.
2009.5 Pontiac G8 GT 6.0L, A6, AFR 230v2 heads. 506rwhp/442rwtq. 11.413 @ 121.29mph 1/4 mile, 168.7mph Texas Mile
2000 Pewter Ram Air Trans Am M6 heads/cam 508 rwhp/445 rwtq SAE, 183.092 Texas Mile
LS1,LS2,LS3,LS7 Custom Camshaft Specialist