Q: Q: Engine running rough

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Engine has been running rough for a few months, engine would stop at red lights occasionally, took it in, they changed spark plugs and the gas cap, worked better for a while. About two months ago it started again, the engine would choke and sputter and die, or almost die but would recover. It would always come back on, if it died. This week the check engine came on with codes p0335 and p0456. This is our only vehicle so we are hoping to get this resolved quickly. Thanks for the help, Nick.

My car has 70000 miles.
My car has an automatic transmission.

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