2008 630i Intermittent misfire

[Glutton]

Ok, so I’m currently running a 2008 630i on 57k miles. It’s recently developed a slight misfire at low revs, usually between 1.5k and 2.5k revs on part throttle. Higher up the rev range there is no issue and equally on heavy throttle it’s fine. It’s usually just a slight cough then no issue and it can drive for thirty minutes and have no issues. Has anyone encountered similar issues?

[Glutton]

Yep it’s an N53, so injectors is the worry. That said the previous owner had replaced one coil pack and you’d assume they’d all have a similar life span so that may also be worth investigating. I’ve done 340 miles in it this week and it’s been fine. Im not sure how clever the ECU’s are on these would it store a fault that doesn’t trigger an EML?