Car Keeps On Idling Wierd....

[2JZEFINI-17]

Ok after I drive the car at a steady pace( lets say 55 mph in 5th gear at around 1800 rpm) for about 5 to 10 min. I come to a red light, I put the car in neutral and it either idles at 500 rpm or it will die completely. I then restart the car and it will either idle back to normal or idle like shit for a little bit and then return to normal idle. I did a self diagnostic and code 14 popped up. Code 14 is IGNITION SIGNAL. Anyone have any ideas?? I just want to fix this issue. I dont know if it only happens at high speeds because I drove the car at 140 mph on the highway for about 15 min straight and the problem did not occur. The car ran perfectly. IF ANYONE HAS HAD THIS PROBLEM PLEASE LET ME KNOW.

CODE 14 IGNITION SIGNAL..