Boscodog

I have a 1987 MR2 with 167K on it and it runs just fine. Sometimes when Im on the freeway it will just die, and I will pull off the road, then I turn it off and then it starts right back up, I take off and everything is fine. Its not a head gasket because that has been checked. I would venture to say it is something electrical or fuel related. Any takers on this?