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Dan,
An injector is certainly a possibility, or a bad
EGT probe. A simply way to test the probe is to trade
places with another probe, like #2. If there's enough service loop in
the EGT leads you should be able to swap them around with changing the
wiring. In that case (i.e. the probe electrical connections weren't
changed) if the #4 probe, which is now on the #2 cylinder, still
reads low it's a probe problem. If the #2 probe now reads low it's an
injector/cylinder problem. I had a low EGT on a Commander 112 that
turned out to be a bad cam lobe. Hope that's not your
problem.
Tom Gourley
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