Yeah when I installed the power fc it solved the issue. After I looked at the readings it would sometimes say my intake temps were 100c (boiling air?). I think the stock ecu relies on the IAT sensor signal more than the power fc causing the spark cut. At first I saw no sign that the intake temp sensor was not working. But after a week or so a check light would flash every once in a while. I would pull your codes and see if that code 14 has ever shown up.

 

haha had a feeling it would be a ecu... I always get new ecu like power fc or haltech before modding a rx7 ^^