Sungyoung, reply to the original post........
The problem lies deeper than what the EXPERTS here mentioned about the depth of igniters.....
Look into the last leg report and see which igniter fails regularly and then try to find out which EEC channel was in command at that time......problem is...as soon the engine start cycle begins and the igniter which was meant to light up fails.......other igniter gets commanded to light up......and another EEC channel takes over....
I have sent my reports and waiting for some reply.....its a manufacturing fault and more to do with the compatibility of EEC channels,ERU,ELMS and Ignition xfr Relays.
its not a quick fix so randomly changing components wont get you anywhere.....try and pinpoint the Channel in EEC which does faulty starts and then start from there!!!