CEL code 15 Honda Starts, but dies immediately

I have a 1995 Honda Accord LX 2.2L that dies immediately as I crank it. Everytime it stalls, I have to turn the car off to get it to start again. The check engine light revealed a code 15, which is ignition. I replaced the ignition coil, wires, distributor cap, rotor button, and the ICM, or igniter. The car seemed to get better and I even drove it around for 45 minutes straight. But once I came to drive it again, it stalled on me in the middle of the road. I've heard main relay might cause the same problems, but why would it throw an ignition code? I thought maybe the whole distributor might be bad. The car has over 250xxx miles on it and the distributor could be stock. Is there anything else that could cause the cel 15 code to pop up? Please help. I've basically been throwing parts at it. This is my first Honda and I'm not familiar with their common issues.