Slight mis at idle

[Oakmere]

My 155 has always felt a bit lumpy at idle. The rev counter doesn’t show any fluctuations and the scan tool shows no misfires. I improved mine slightly by spraying contact cleaner/protector on all the coil pack connections when fitting new iridium plugs (apparently adopted by BMW for all THP spec engines).
Also the latest software update helped.
I think it is the nature of the engine though as has been mentioned on here and on the Mini Cooper forums.

just to confirm mine is a slight stumbling at idle not the bad idle where the car is nearly stalling and the Rev counter is jumping about.

[Belle-ile-blue-ds3]

Cheers for the help guys.

Several people have mentioned now that it's a trait of the engine to have a slight lump to the idle so I'm just going to ignore it for now. It's only very slight any way

[Chris_Blue]

keep the engine well maintained and hopefully no problems