engine malfunction in the morning and at cold engine

[naikai]

hello please help me out. i got warning "engine malfunction reduce power" at start up in the morning or either cold engine start within a day. i have to leave them run for 15 mins or drive for a while and shut them off and re-start the engine so they will be back to normal. i got error on intake solenoid and have replaced with reset the error but the error still come back in the morning again. Anything i must replace or check it. by the way, i replaced both solenoid as well but still have the same error. thank you for your help. N54 eigine.

[dmlgc]

I had the same symptoms on my previous 50i , it turned out to be bad injectors.
May not be the same issue but sounds similar.

[big_al_Z]

If it's the injectors, it should be covered under the "customer care package"