I had my XSport going in for service and when switching back to stock tune, my LMS MyCal tuner kept timing out in the middle of writing and would lock up the vehicle. I was starting to get worried... took about 6 tries to get it back to factory settings. I tried updating the tuner again after the service and going back to my 93 Performance tune, but had the same issue, about 6 tries just to get it back to factory settings again. Seems my tuner is bad and should receive my replacement tomorrow.
Missing the custom tune, the stock tune really bites!!!