How many miles are on your car?
Do they use mix Ethanol in your unleaded fuel?
If there's a problem with your car a Check Engine Light (CEL) will indicate, there's a problem.
It was cold, so your car was probably running a little rich until warm.
Depending on miles,if 100k+ you might need a good tune-up.
Air filter
fuel filter
plugs
wires
upstream H02 sensors.