I suggest unplugging the wires to the egr, one less possible glitch, even if the tuner says leave them alone not to worry, unplug them.
I had issues when I blocked mine leaving it plugged in with the tuner saying I don't need to unplug it.
Put a little dielectric grease inside and tape the ends up.
2007.5 GMC Sierra 3500 SRW L.B."BLACK" C.C. 4X4 LMM Z71
DIY stock airbox mod, aFe ProGuard 7, OEM drop-in
EFILive ECM ATP - Heavy Tow Tune with Turbo Brake.
EFILive TCM Duramax Tuner
DHD Cold Side High Flow Intake Pipe
DHD PCV Re-Route
2007 Yukon Denail "BLACK" 6.2 gasser
DIY stock AirBox Mod, K&N, Airaid intake, EFILive TCM only tuning