[fiveohpatrol]

Head gaskets can certainly make you pull your hair out before finding the problem

I had a similar problem a little over a year ago, maybe its in the archives "cooling problem from hell" and "cooling problem from hell, part deux"
The problem would come and go as it wished, so it was very hard to diagnose. I kept telling myself it was just an airpocket in the system, but i just couldnt get it out.
But then when I drained my oil, and ALOT of coolant came out before any oil, then I knew it was the head gasket.
Its really not that hard of a job to do, and it gave me the opportunity to port them out, which has helped alot with power.

Good luck with it,
-Drew