Check for air leaks, too. Unplugging the MAF will also effectively zap bad running due to leaks.
I ran my old BMW 328i with the MAF unplugged for four months including a track day with no ill effects, so I wouldn't worry too much - the ECO will just default to stored values that aren't too far off reality.
It will run a bit better with a good MAF plugged in, however.
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Manual '00 3.2 S Arctic Silver
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