It is an 87 Integra.
The thing is, I might drive it 2 weeks without this happening only to have it occur multiple times in one or two days then disappear again.

A couple weeks ago when this happened and I'd changed the thermostat and it was still overheating, I gave up and took it to my mechanic. Of course, it never overheated for him...isn't that the way? I went ahead and had him flush the radiator so they covered that end of it. I *assume* they bled the radiator correctly.