An IMG leak puts coolant into cylinders 1 and 4 typically, so worth removing these spark plugs for examination. Spark plugs with a 'washed' appearance, perhaps with pink staining on the ceramic part are a sign of coolant contamination. This does produce a lumpy startup which improves as the egine warms up.
I haven't heard of the gross steam emission you describe during acceleration though. Are you sure it was steam and not pale blue oil smoke?
You clearly have a coolant leak that's quite serious for this engine, so essential to get it sorted.
TC
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