I have a e87 130i too and have the same problem. Its the valvetronic going bad. Its common on these engines i didnt replace mine yet cuz it goes away after restarting the car.
E92 M3 Melbourne Red/Fox Red Ext.'08 M Driver's Pack-E87 130i Titanium Silver/Black '07
E63 M6 Indianapolis Red/Champagne Full '05
SOLD:E46 M3 Imola Red/Cloth/Black '01-E39 M5 Blue Water/Grey/Black '99-E36 M3 Dakar Yellow/Black '96-E36 M3 Hell Red/Black '93