This is obviously something to sort out before JAE and after a little research on the other forums it's one of either three things.
1) One/More sensors is loose/rotting away most likely on the engine bay side of the loom.
2) Defective Motec, there's no reason why this particular ECU should forget anything unless the Optima went flat for a while (unlikely since the starter motor's turning). It's more likely that the car got struck by lightning to cause a surge strong enough to wipe the memory.
3) CoilPack and/or distributor is faulty/knackered and not strong enough to ignite.
I believe the latter is more believable out of the three but we're hoping it's 1) as it's the cheapest fix. Well... 2) should be free since the tuners got it for him!