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Compression check and pcv valve are both good ideas.

Update: The car still has a CE light. I haven't done anymore work on it recently, got tied up with other projects. It runs fine and MPG is...

I changed the front o2 sensor but not the rear. The code stayed off for a few hundred miles but now it's back. I haven't checked the code yet but i'm assuming it's the same. I guess I'll change...

We don't have inspection either but the problem started at the same time as the oil leak plus we're not getting the MPG we used to. I'm going to replace the upstream o2 sensor. From what I read...

So a few days later and the car still runs great. I got the OBD2 scanner and phone app. Now we're getting a P0420 code.
catalyst system efficiency below threshold

Should I clean the 02 sensors?...

New coil fixed it. I still have a CE light. Code was cylinder 1 misfire but the middle two cylinders have been the oily ones.

I just put in a new coil from autozone, it idles fine. I'm about...

I just changed the plugs, still runs rough. I have coil on plug ignition, not spark plug wires. The middle two had a bit of oil on the ends. I cleaned them with electric cleaner and then blew...

I've found lots of info here for working on my wife's car but now I had to join to ask a question.

She suddenly had a very rough idle and very little power below 2000 rpm. I pulled the plugs and...