Took me one hour to take apart and fix. The problem WAS the belt being one tooth off on one side. The timing marks on the belt are wrong. Also - seems the information in the OEM factory service manual is wrong - but since I don't have one myself - I'm going by what others are saying.
I went to three Subaru-only repair forums. The info I got from all three, supposedly from factory service manuals - was and is wrong.
I found the marks on the original belt - counted the teeth, remarked the new belt with an ink-writer and put it back in. Runs great. Very smooth again, and no more "check engine" light.
This is proof that somehow, the OBII system does have a way of sensing poor combustion on just two cylinders caused only by incorrect valve timing - and callig it "misfires."
Took me one hour to fix, but 2-3 hours of seacrhing for info on the Net. Subaru has a Wehsite with timing belt install info for a 2001 2.2 SOHC engine and that tooth count for that engine is different then my 2.5. I'm wondering if that's where this confusion comes from.
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