I have been to my local BMW in Melbourne 5 times in the last maybe 5 weeks b/c of rough idle issues and misfiring. All issues have been corrected but occasionly at idle the car will hiccup for a quick second within several minutes. After my las visit for this same concern they finally brought up intake valve cleaning.
reason I ask if your local dealers did this is b/c I hope Melbourne BMW will cover this under CPO.
07 335i-Prem pkg-Spts pkg-6 Spd-Coral red leather-Carbon Fiber trim-M3 steering wheel-M3 knob-Red stitched boots-Logic 7-Orion V4 angel eyes-Mtec 6k HID-LED Fogs-6k LED License light-Blk lower grill-Blk kidney grill-blk window trim-4" exhaust tips-JB4-BMS DCI-CPE charge Pipe-VRSF Downpipes-GS FMIC-Aero front Lip-M3 Sides-Performance spoiler-LCI Tails-Roof spoiler-Painted side reflectors-20% tint-Blk Calipers-19" Alufelgen SF-71