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O2 sensor and check-engine light

I almost always get a transient "check engine" light when I'm accelerating
the car hard, especially when it's not warmed up yet (regardless of
temperature).  (It's an '88 5000 CS turbo with the Intended Acceleration
mods, but it did the same thing before I had the ECU fiddled.)  It used to
annoy me but now it's just part of the Nature of Things for me...