What causes car to buck when i get up to certain mile and also it is using a lot of gas when this happens. Had plugs and wires replaced but it is still bucking. could it be in fuel system?
could be the egr valve, a bad o2 sensor, even a clogged fuel filter, bad injector, start with the chepest things first. Dont forget to check the air filter it may be clogged!
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