It's not the variator, air filter, fuel filter, plugs, temperature sensor or lambda sensor, cos I've changed them all.....it sounds like you've got and identical fault, 1st thing in the morning is the worst, closely followed by coming home from work.
I changed the temp and lambda sensors, cos the diagnostic showed them as being faulty. Tell me if they find anything on yours, it seems to be a fuelling problem (injector cleaner and a dose of "dry tank" doesn't help either).
Good luck !!!