That kind of stuff started happening to me recently. I'm doing an engine swap now. The rear seal was leaking oil onto my clutch. Ruined my clutch and flywheel. Someone first told me that it was the slave cylinder, but the problem wasn't fixed when I replaced it. I had to look further into it, and the problem was a lot worse than I thought it would be. Be careful. (The slave cylinders to wear out fast on those cars.)
It does sound about normal though. Oil and plugs and wires are good to check.
I have a test pipe instead of a cat. It doesn't really do much for the gas mileage...