I have been working on my brother's 88 Wrangler 2.5 for the past few weeks. I noticed that it has been leaking/spraying oil out of the valve cover and oil filler cap. The valve cover and cap are relatively new, so I checked the pcv valve (also relatively new). I sprayed the pcv valve clean and before I reinstalled it, I tried to run a piece of weedeater string through the hard pcv line into the intake. What I found was a tube that was completely clogged. I used a piece of wire and brake cleaner to clean the tube out.
Hopefully I fixed the problem now. I also think that he has a sticky idle air control valve. How do you guys remove these things? I tried an adjustable wrench, but I couldn't get it loose. Do you guys use an oxygen sensor socket or something similar?