2.4L hesitates after cold start

i have a 2001 GASE 2.4L , when i start my car after its been sitting for a while, and go to drive it it feels like i have no power the car revs up to 4000 and then starts moving and it takes forever to get up to 45 km , my car has 78000km on it i have 10 w30 synthetic oil in it, after its warmed up it runs fine.

What could be causing this...?

Thanks