She gone and broke it..

[Racing Rice]

My wife's '95 Civic LX is pooping out on us. I have a feeling it's a head gasket, but I want to see what you all think.

- The car fires up fine.
- The temp rises and at idle the temp guage reads normal. However, if you take it for a drive the temp guage will begin to climb. It will drop back to normal if you stop and let it idle again.
- The car is bellowing white smoke, and starts to miss when it warms up.
- I pulled the plugs out and inspected them, the #4 plug (? furthest from the distributor) has a little oil on it. Probably why its missing, eh? lol

I guess I need to do a leakdown test on it and see what I can find. Anyone have any suggestions?

The oil on the plug indicates that it could be rings, valve guides, or head gasket, right?