Well it was low on coolant yesterday, I got it up to temp to test the coolant for combustion gases, it then started to bubble significantly. Then coolant started bubbling out of the degas bottle. That happened for about a minute then it went back down, but as I said before, I did a combustion gas test and it showed very little if any combustion gas in the coolant. So it does seem the problem is intermittent and I have been running straight water for the last week or two so I don't know if fuel would show up in water as it does in coolant. I still suspect that fuel is getting into the coolant and causing the degas to relief.