No, no, NO!
Cold weather brings on vac leak issues - most often the intake manifold gaskets. The symptoms are high idle, idle/stumbling issues, and hesitation at tip-in. A severe case will cause a lean code CEL.
bucking & hesitation are typically caused by 2 things:
- Fuel pump & filter
- Plug wires - sometimes plugs
Symptoms of plug wires will be a miss at low/moderate rpm & seemingly OK running at higher rpm.
Symptoms of fuel pump will be hesitation, bucking, lack of power at higher rpms in particualar, but can happen throughout rev range. Symptoms get worse with low fuel levels and go away temporarily after the car sits overnight (pump & filter sock indicated on those last two).
That is by no means complete. Your symptoms/conditions may vary from the norm, but generally that's what you can look for.
So, if you have bucking and it doesn't get worse when you have 1/4 tank or less fuel, your problem is most likely your plug wires and/or plugs. Get Auotlite APP764 plugs (and gap them!) and a good set of wires - Motorcraft OEM from the dealer ($$) or some Autolite Professional series. Some people have had good luck recently with Taylor Thundervolt wires purchase over the internet. I have no experience with them.