A faulty Ignitor would effect 2 or 4 cylinders.
An issue with the coil would effect 2 cylinders,
An arcing plug cap or problems with a carburettor could effect just one cylinder.
Corrosion withing the Plug cap can cause misfiring which can come and go.
Bypass the Ignition Key circuit to rule out the Ignition switch if necessary.
An issue with the coil would effect 2 cylinders,
An arcing plug cap or problems with a carburettor could effect just one cylinder.
Corrosion withing the Plug cap can cause misfiring which can come and go.
Bypass the Ignition Key circuit to rule out the Ignition switch if necessary.