Vf commodore tuning

[will15]

Hi I recently tuned a vf commodore with a e38 this was my first vf tune but I have tuned plenty of earlier e38 ecu?s. It was a very basic mafless tune where I didn?t really change to much apart from setting up a mafless tune a little bit of tweaking of the fuel and spark after about 4500 rpm. Now the guy is saying the car is running like shit and bucking around on the highway, but this problem is Intermittent and blaming the tune. It all most sounds like a burst knock issue but I have tuned all that off. Could there be something iv missed between the earlier and later e38?. I will post the tune later. Cheers for any help.

[dynotech]

Really need the tune posted and if possible a log of when the issue occurs (may not be possible if your customer is some way from you) Regards