there have a been a few threads about this, and it seems to be the newest software and how it primes the hpfp (possibly) prior to starting. I too was getting rough starts but after a minute of idling, no codes or anything and then the car ran completely fine.
Although, after I complained about it to my dealer (it took 2 times...) they replaced the hpfp and the car starts right up now. It is always something with the n54
991.1 C2S PDK, Guards Red | PDCC | Sport Chrono + | Clear Tail Lights | Alcantara Steering Wheel | AWE Switchpath Exhaust
Previous: Porsche 997 Turbo 6MT, Atlas Gray | Cobb Stage 2 | HRE FF01 | Europipe Stg. 2 Exhaust | GMG LMS Rollbar | GT2 Exhaust Tips | Pagid RS-29 | Rennline Pedals | SSK
997.2 Track Car, heavily modded & E92 M3 DCT, still miss her daily & E92 335i heavily modded