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I was asked by a friend to check his car because it was stumbling and ran like crap lol. I checked it and the first thing i noticed was that the air filter was soaked in oil. whenever you accelerate the car there is oil coming up from the intake manifold. Can anyone give me some input into this problem? He said he had a mechanic checked it and said it was the heads gasket or just running with 3 cylinders. Any helped would be really appreciated. thanks in advanced.

Sounds like oil blow by possibly. Tell him to replace his PCV valve (plugs into the air tube with a hose, and the other end plugs into the valve cover) and see if the problem goes away. GL.