My check engine light is on and white smoke is coming from the tailpipe car cuts

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My car cuts off while I'm driving it does this hesitate while I'm driving and cuts off. oi just had the oil changed filture. Now the car has wait smoke coming from the tailpipe. I also had the fule pump changed. I dont know what's wrong with my car I just purchased this vehicle in November. Pls help Thank you Stressed out driver.