Well, if the EHA is failing to properly adjust upper/lower chamber pressures, then I suppose it could wind up being either rich or lean, depending on which "direction" it was failing.

I would still check the temp sensor by measuring its DC resistance, and comparing it to the temperature/resistance chart. The symptom you have seen with a bad temp sensor is what happens when it fails completely. If its value has drifted, that might give different results.

It's also possible that something got disconnected when the work was done. Also, on an M103, there is always the possibility of vacuum leaks even in spots you have already fixed.

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-tp


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