My car starts up it drives for awhile then it starts stalling and shuts off.

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My car drives normal then it starts to stall and shuts off. Immediately I restart it and it has strong gas smell threw out the car like it is dumping to much gas and it runs rough. I turn it off let it sit for 2 mins and it runs fine for a couple of miles. I took it in too the shop and they said the ECM is not reading the car.