Taurus wagon jerk/stalls when braking

i didn't see this problem anywhere. this car feels like the whole engine just fell out for just a second. it doesn't really stall but you can feel that there's weird things going on with the shifting. i'm scared to say transmission. my sister had a car that did the same thingbut when it was accellerating..not braking and it was the rear sensor. i don't understand sensors or how it could make an engine do that but i don't know anything about cars. we've checked all fluids and all are ok. but someone please help!

Welcome to the forum. What year is the Taurus and which engine does it have (3.0L OHV, 3.0L DOHC, etc.)?

When is the last time the car had a tune up performed on it (spark plugs, wires, fuel filter, air filter)?

-Rod