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Q:

bucking occurs after every gas fill up and then occassionally on and off after that on 2001 Nissan Sentra

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Weekly the car bucks and always after fill up
(2) Answers
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I wonder if the canister purge valve is sticking open and when you refuel the intake manifold is filling with fuel vapors. I just looked there are two service bulletins from Nissan about the evaporative system having problems.
I dont think the bucking is associated with the gas fill ups. Sounds like you have a secondary ignition problem that needs to be fixed. (cap,rotor,wires, fouled sparkplugs, etc.)