86MUDRCJ
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Did you re-tighten the valve cover bolts? Sometimes they need snugged down again after a little while of running.
How old is the PCV valve if you dont know change it and at every other tuneup they are cheap. A winter tuneup is in order plugs,cap,rotor and wires if you havent done so yet. Eliminate variables as in preventative maint first and look for vacuum leaks. If everything looks good to check the egr pull the vacuum hose off it and run a manifold vacuum hose to it at an idle the engine should stall when you apply vacuum you can use a hand vac pump also. A vacuum guage might also give you a clue as to what is going on and pull the codes look under EEC-IV in the tech library.
Spray carb cleaner around the intake manifold. You could have a vacum/oil leak towards the back of the engine.
use a piece ov vacuum tube about 2 or three feet long put one end up to your ear and search around with the other end you will hear a hissing when you get close to a leak and can pinpoint where it is. Works on exhaust leaks also tape a soft wire on the end of it to reach hard to get at places. Watch out for moving parts.