car has trouble starting, what could it be? Options

[6strngs]

yeah, I've pretty much noticed this since a little before I got the car, but when I go to start it up after it's been sitting a few hours, it'll start, and the RPMs will shoot up to where they are supposed to, but when they come back down, they don't stop at 750 or whatever idle is and keep dropping until they reach zero and the car dies... so I'll start it back up, and in order to keep the RPMs up, I'll rev the engine. but as soon as I let go of the gas they drop real low again, so I rev again. usually, once I rev it to ~6000 and let it come back down it'll idle fine and then run fine for the rest of my trip, and if I shut it off for a while and come back, it'll be fine. but if it sits for 6 hours-ish or more before I start it up again it'll do it again...

what could be causing this?

[Negative]

Sounds like you got the right idea. hope it works out ok. you need to figure out why oil is coming up that line. maybe put the breather back on there - deal with the sound and look for oil coming out. That is def. not normal. I've removed mine several times in the last 3 years and i've never seen any trace of it there. As I said there is supposed to be a baffle plate there for this purpose and I can't think of anything that would have damaged it except maybe a careless mechanic. I assume by your questions that you have never pulled the valve cover.
I'll help you through all this anyway I can. Just hit me up. It's not hard to pull the valve cover but you gotta be careful, ie. not strip out stuff. Just take your time and make sure you are not damaging things in the removal of it.