Car has come from another garage with a new AMM, it also had new coils which didn't help so originals were refitted.

This issue is a very rough/lumpy idle almost to stalling which is intermittent but does seem worse when hot. The P codes have not logged since we have had it.

First thoughts were an intake leak so smoked inlet and found nothing? Also scoped cam and crank which do not change during rough or good idle condition, also checked fuel pressure serially which appears fine. It has had some previous head work apparently before the customer bought the car which pushed us towards a possible timing issue hence scoping of the cam/crank but no syn codes. Also when it's running rough it pops back through the air box.

No other actual values are jumping out at us? Fuel trim seems fine (4% total)
Interestingly when you unplug the AMM the fault clears? (Obviously the reason it was replaced) So still think possible air intake calculation issue? Have heard of these suffering from the breather systems but unfamiliar with these issues myself? Not sure which way to go next with this one, any ideas welcome??

Thanks for reading