I've been thru this. I bought an FG that had a stalling problem (me being the third owner). The second owner of the vehicle spent $15000 on mods at a top Perth Tuning place to be left with an FG that stalled. That is the reason why he got rid of it. The tuner had a few goes in trying to fix. I saw that he played with some dashpot parameters in the tune to try to fix it but he was way off the problem. When I bought the car I rang the "top perth tuner" to try and sort the matter out. He said he thought he fixed it. He also lied to me and said the car was stalling before it was bought to him. Complete BS. He was of no help, I just saw he wanted to try to get money out of me instead of jointly trying to solve the problem. Anyway at the time I gave the tuner the benefit of the doubt cause he was " a top perth tuner" and I didn't think the tuner was the cause of the problem. I didn't want to blame someone for something that I wasn't sure of. I tracked down the service history of the vehicle and there was never an issue with stalling prior to the modifications, the first owner of the vehicle confirmed this. Nevertheless I had a tuning background, learnt HP Tuners and it was pretty clear once it was solved that it was ALL caused by what the tuner did. As I said before, your original tuner may NUT it out. But if he does not, do not be afraid to politely say that thankyou for your work, however the vehicle does stall after you tuned it. You have had a couple of goes at it with no success. Now give me a refund for the tuning work and I will let someone else have a go. The tuner may be a great guy. You did not pay for a car that stalls