After rereading your post I have one question. Do you have after market injectors or fuel pump? Could be flooding with fuel causing it to not start.
Could also be coolent running into your combustion chamber. I've had this happen once to my brothers nissan 240. He blew his head gasket but not bad there was no evidence of it. Just that every time we pulled the plug on the fuel pump fuse it would start but run really rough. So I pulled out the spark plug and sure enough coolent water jumped up almost 2 feet into the air when we tried to crank it.
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