I have an 89 lude and I noticed that I have oil leaking from the injector port on the intake mani. What is the cause of this?
Also, when I start my car cold it idles normal; however, once it is warmed up the idle becomes erratic (going from 500rpm-1500rpm repeatedly). It goes away once I start to drive my car. There are no CELs so I'm not sure where to start looking.
What do you guys think of the oil from the injector port and the erratic idle?

 

It could be a bad PCV valve?

 

The idle problem sounds like a faulty idle air control valve...From the pic, that would have to be oil coming from above possibly from valve cover gasket

 

no

 

I've taken my upper manifold off and found oil on the middle runners because of a bad PCV valve.

 

I forgot to mention that there's oil coming from injector ports 1 and 4, but 2 and 3 are clean. I didn't notice any oil leaking from the valve cover, but I will check again carefully. Might as well replace the PCV valve since they're cheap. Let me know if anyone comes up with anything else. I've never seen this before...

 

Dried fuel+dirt=looks like oil.

You have a fuel leak. Replace fuel injector o-rings

 

I'm with Jlude90 on this, replace the oring first.