I own a 1986 Toyota 4runner. Tonight after a short trip noticed a oil leak. Its coming from the area below #1 intake port, where the head & timing cover meet. Is it more likely the head or timing cover? She's got 212,000 miles on her. Also got a slight miss in engine. Performed a tune up, but still there at times. I was planning on pulling valve cover & checking timing chain for wear & also the valve adjustment. But more worked up over oil leak at this moment. Any idea's or help with this would be thankfull.