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If the engine runs reasonably but missing at idle then I would suspect stuck rings. Very likely with 400+k miles. I would take the head off, take the sump off, undo the rod bearing and push the pistons out from the bottom. Scrape all carbon off, clean the piston groves. Inspect the rings, replace if necessary. Check rod bearings and replace if necessary. Reinstall everything with new head gasket. I have done mini overhaul on the om603 with very good results. However it is your call. Good luck.
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