John, are you sure the over-fuelling wasn't a result of an incorrect pressure being sensed by the MAP sensor, or an inverted signal? The level of over-fuelling your car had looked off the chart, and reminded me of two recent car issues:
1) the tps failed on my sister's car, and the ecu thought the throttle was 100% open, so fuelled accordingly.
2) my friend's emerald ecu had a corrupted voltage being fed to it from the map sensor, and the fuelling went off the wideband scale - a manifold pressure correction was being applied by the fuel charts.
Whilst your ECU is away, it's probably worth double checking the wiring, as I'd be really surprised if your ecu was meant to be fuelling like it was, rich map or not.
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