R33 GTR series 3. Airflow meters seem fine, I've got an Apexi FC (unfortunately) and the hand controller still registers airflow while the car is switched off but decelerating (obviously when the motor stops spinning they read 0). I'm wondering if it could be a ignitor problem? So many possibilities, will have to have a weekend of investigation this holidays.
Absolute blast from the past. I'm now having the exact same problem as mentioned in the post. Car will turn off when driving, no missing or carrying on just turns off like a light switch. If you turn the key off and start it again the car will restart no worries at all. Did you ever find out what the problem was with your skyline?