2016 M240 "lumpiness" at steady low speed

[Sussex Kev]

My car exhibits a lumpy performance at steady lower speed (around 40 mph and 1000 rpm) anybody had this?

[Greydog]

Morning Kev 

Welcome to the Forum

If you drop down a gear or two to increase revs what happens? When was the car last serviced ? A misfire could be Coil Pack failing Plug failing a vacuum or air leak on the inlet, I would start with a diagnostic scan and go from there.

Dave

[Sussex Kev]

2 hours ago, Greydog said:

Morning Kev 

Welcome to the Forum

If you drop down a gear or two to increase revs what happens? When was the car last serviced ? A misfire could be Coil Pack failing Plug failing a vacuum or air leak on the inlet, I would start with a diagnostic scan and go from there.

Dave

Thanks Dave, it's just noticeable at that lower steady speed, higher steady speeds it doesn't seem t happen, there is an occasional hesitancy to accelerate when 'floored' mind.  Think the scan step is required!