RacerX

This past Sunday my e60-M62 had a rough idle at startup. It had never done this before and I was guessing that it was a bad sensor. The issue was present on Monday morning and I drove it to my local dealer. I parked it outside and requested that they leave it there until a tech was ready to diagnose it. It was cold here in Chicago, -20C and I did not know if that had something to do with it. Yesterday, my SA told me that they could not reproduce the problem and said that it may have been bad gas. I laughed and told her that the same gas is in the vehicle now and that it did not magically go good. They wanted to keep the car another day to investigate further and I agreed. I saw a SIB on this forum with the following situation:

SITUATION
Customer may complain of erratic engine idle speed lasting for approximately 20 seconds after a cold start. Check Engine Soon light may be illuminated and misfire faults for various cylinders (e.g. FC 2742, 2743, 2744, 2745, 2746, 2748, 2749, 274E) may be stored in the DME.

CAUSE
Incorrect tolerances and geometry of Valvetronic intermediate levers are causing uneven cylinder filling during the transitional cold start period (60 seconds after the engine has been started) when the Valvetronic system is switching from the initial 6 mm to a minimum 0.3/0.8 mm valve lift.

In my car, the situation lasted more than 60 seconds. The issue was present until I shut the car off. I was wondering if others have/had the same issue. If so, what was the remedy?

Thanks