Ihave a 1989 Mercedes 260E and its been parked in my garage for almost 2 years. i just recently began to try to fix it. I used to drive it daily two years ago, and it ran perfectly, but once i stop driving it for a few weeks, it will start to act up again.Today, i pulled the air filter out, and opened up the throttle, and i spotted oil in the intake manifold. Does anyone have any idea what the problem is and how much it would cost to get it fixed?

 

any body?