Had the engine stumble, then finally lose complete power. No service lights came on.

Had the engine stumble, then finally lose complete power. No service lights came on,but the car inmediatly start up the engine again with some smells like gas and something else. this situation came suddenly but just when the car stop, It happens 2 o 3 times and the car behave normally I scanned it but no code show up, I clean the acceleration body and change the Spark plugs and nothing.

I will thanks you if you could help me.