Q: Sputtering and stalling

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I recently had my check engin light come on and took it to auto zone to be tested. I had a misfire and if was bad spark plugs. I changed all the spark plugs myself at home, once I changed them I turned the car over and white smoke came out of the muffler and the car ran fine. After driving about 5 minutes the car started to shake and shut off on me. When this problem first appeared the car was shaking and check engin light came on. Now the car is stalling and sputtering

My car has 166000 miles.
My car has an automatic transmission.

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