95 sunfire... lack of power when cold?

Ok i just got a 2ed hand 95 sunfire.....Now it works great when i got it but, when i get up to go to work...The car will have no power till say 10 min later of driveing at low power and then it just kicks in like boom a small push back and everything is fine....But if i have to drive up a hill i can have the gass to max and the big hill will take me at like 5 km/h...
If i turn the car off after the 10 min or so it works fine but when it is cold.. it takes time for the power to kick in...I need ideas ...

If anyone can help email me at [email protected]

Or here i guess...but email would be faster...