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Bucking occurs after every gas fill up and then occassionally on and off after that

(2001 Nissan Sentra)
in Cumberland, RI on April 12, 2011
Weekly the car bucks and always after fill up
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Popular Answer
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.
on April 12, 2011
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.)
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