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Once again, if you try and remedy this problem with an a/f controller, my guess is that you'll be remedying the symptom and not the cause. I still don't think the problem is your a/f ratio- with the engine still in stock trim, it's pretty hard to run rich. Check your fuel injectors though, just to be safe. Wouldn't you rather fix the problem than work around it?
With a 1992 (assuming average mileage), I would guess it's one of two things: Either your valve timing is off, or your piston rings are showing some wear.
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