1986 Chevy Celebrity Celebrity Shakes and hesitates when Ga

Greetings,
I bought a 1986 Chevy Celebrity and it has some sort of firing problem when the gas pedal is pressed. The car will shake and jerk and if I hit the gas hard it will eventually speed up and stop jerking for a little while. We have checked the timing and the cold temperature sensor(?) That regulates the amount of gas given by the fuel injector at cold temps(is what I was told). The question is, do you have any suggestions as to what it may be? I am trying to make a cheap fix since the economic collapse has left me with far less income, but I fear that if I bring it to somewhere then I will be ripped off because I dont know what it is. Also, I live in Fairbanks, AK and as you may imagine it gets very cold here and wasnt sure if knowing that would aid in diagnosis. MANY THANKS IN ADVANCE! You will save me for this coming and brutal winter here! :)