Ford Taurus Forum : “Car has periodic hesitation when driving, almost like a stall, but engine does n...”

check your distributor cap, rotor and spark plug wires. It sounds like you could be getting moisture in the system,
that would cause the hesitation. Also, check your AT fluid, that would cause hesitation if its low. Finally, a bad
crank position sensor could cause some degree of hesitation.

These cars also have a history of bad egr valves and selenoids.

When was the last time you changed the fuel filter? Also have you had the fuel pump checked?

it could also be your O2 sensor or anything electrical