Misfire (?) from cold

[jonhlemon]

Hello guys, i have a 2001 clio 2ph2 1.2 16v with 192k km.
My problem is that when it's cold, when i press the gas pedal it takes like 1 second to accelarate, giving impressions that it's a misfire.
It has been 3000 km since the last service where i changed the plugs, filters and oil where nothing has changed.
What can cause this? Coil pack? Fuel pump? Lambda sensor?

Thanks!