I’ve began to notice an occasional slight hesitation from the engine while driving at a steady speed. What could this be? Car is a EU1 K series, with Emerald & TB. The obviously things to me are to work backwards from the spark plugs, to the coil.
Anything else to check? I can plug the Emerald into the laptop to see if a sensor is dud, but it seems to run OK otherwise.
Thanks in advance.