ORIGINAL: Dan9687

ok, so yesterday I changed out (1) spark plug. Spark plug at cylinder 6. Why cylinder 6, well like I said six months ago this same problem happend. So after replacing spark plug on cylinder 6 the check engine light went away and car runs great, no smoke and no car shake. And yes, there was a light coating of oil on the old spark plug. So my guess is cylinder 6 valve stem seals are junk, so I could be lucky and have a real cheap fix by only changingthose two seals, to a potenially expensive problem.