Sometimes it feels like there is a misfire even when engine is at running temp, car is 70 reg 43500 miles and regularly serviced (most recently 2 weeks ago) however they didn't change the sparks plugs because they're long life with multiple end points mechanic said around 80K miles is usually when they're due to be changed.

Is there any known issues with this engine? I always use shell fuel E10 petrol.

The only thing that comes close to a misfire in mine is when it goes into 2-cylinder mode. The slightest of hesitation.

It’s not every time; mostly notice it when the engine is under light load with ACC engaged, rarely at other times.

That could be what it is 🤔

27 minutes ago, SteveTheElder said:

The only thing that comes close to a misfire in mine is when it goes into 2-cylinder mode. The slightest of hesitation.

It’s not every time; mostly notice it when the engine is under light load with ACC engaged, rarely at other times.