Sometimes when I put it in reverse,the idle dips down to around 500rpm,almost wants to stall,then it will finally smooth out.It happens around the end of this scan,when I go to back up my driveway and again when it was just sitting and I was going between drive and reverse. The motor is a 2003 Express Van 6.0L and 4L80E trans. All bone stock.Not a daily driver,just a toy. Running SD with trims off.Tuning off of the wide band. This only happens when I put it in reverse,no other gear,and it is intermittent also. Otherwise how am I doing on the tune? Are the settings on my trans too high? It shifts like a little nudge from a loaded tri axle truck,I LOVE it,wife not so much.I think the VE table is pretty close and I just ordered the cam and springs,so I get to do it all over again soon.All comments welcome.