Our 2001 Outback, 2.5 liter, 48,000 miles on it, has been to the dealer 3 times in the past month for the check engine light. The problem, according to the dealer seems to be a mis-fire in one of the cylinders, but not always the same one, so a tune up was performed during the second visit. A few days later the light was on again -- it was reset on the third trip and sure enough three days later it is on again.
BTW -- the tune up included new plugs, wires, fuel filter and air filter.
Any help / direction would be appreciated.