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Had the same problem and had engine malfunction errors on slow take offs and highway driving while wanting to pass, found it to be the pressure converter and a vacuum leak from a tube going into the unit. Their was a hairline crack in the tube.
Basically what was happening was at slow take offs the vacuum was not strong enough because of the hairline crack and the error was thrown, on hard take offs the vacuum was strong enough that it was registered and l the engine malfunction error didn't happen
Part number for my 2012 was 11747626351
Once the tube was trimmed and reapplied the code and engine malfunction disappears. Yay!
Not sure as it could be countless issues but I found what your Origanal issues you explained where exactly what I was experiencing and what fixed it for me.
Dealers where telling me it was my vanos and a laundry list of much more expensive things and all it was, was a simple tube trim.
I replaced the pressure converter just because it was cheap and figured it wouldn't hurt.
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