fxpthl64

OK you got me! These old eyes didn't bother to see the PCV valve on the other side just like you said. All I can think is that the tube is some sort of "re-breather" for the valve cover fumes.

90miata

I appreciate the help. So either way that hose shouldn't be the cause of my issue?

On my way home I'm going to grab a compression gauge so I can test my compression and thinking about buying a timing light as well because I remember someone mentioned I can advance the timing tj get a little more pep out of the engine.
As far as the spark plugs I believe they are still good. The tips are a little bit rounded which I don't think is good but it's not horrible. One spark plug did have quite a bit of oil on the threads. Is this something I should be worried about or is it ok?

sixshooter

Threads are fine. Oil on the electrode would have been an issue though.

fxpthl64

So 90miata, how are things going with your issues?