yes, but you also said it is still a running in map, you never gave how much history as to when it ran perfectly for.

You said it had been laid up, and possibly now with some short start stop scenarios which could lead to plugs either flooding or fouling if the cold start wasnt great. Which in turn could lead to it going off cylinders.

Hence...get mapping checked, and fit new plugs.

yes there may be other issues...but without some ecu information in front of me, or the car in front of me....rather difficult to diagnose.