Back in the day the first thing we would do was put in a new set of plugs. These days modern engines and plugs go 100K miles on a set and we forget that spark plugs can be fickle, so treat your car to a new set.
Eric has alluded to fuel problems. I would add that the fuel filter is a consumable item and changing it is also doing your car a favor. A partially plugged filter or water in the filter can cause your symptoms.
If you only drive your car infrequently then it should be a long drive to get the engine hot and some full throttle accelerations to clean the plugs.
76 Suzuki GT500
2011 Jaguar XKR
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Last edited by alfaparticle; 08-23-2018 at 05:52 AM.