I have just been checking the last log of the sdcard, and have found the problem,
its the speed signal that goes to zero for a very short time, so the launchcontrol activates,
I do belive that its a firmware glitch that does this, as i loaded 1.2.11 firmware into a car that have been running for years , and this also have the stumble now,
But that car is 400km from me, and my subaru cant run any older firmware then 1.2.13 , so i will just disable launchcontrol on mine,
but my other customer uses launchcontrol for 1/4 mile racing, so i will have to find a solution for this problem.
Thanks,
Skassa