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if it still putters after you turn off the car, its the valves. after a while alot of gunk builds up on the valves, and what happens is that all that gunk is heated by all hte combusting in the engine, so when you turn off the car, that gunk is still super heated so it will ignite any gas thats in there. so you get combustion even though the car is turned off, and thats your car sputtering after you turn it off
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