my van hesitates, sputters and sometimes cuts off on 1996 Ford Windstar

this happens only when i'm slowing down or coming toa stop. at idle i'm okay as well as accelerating. help? recent oil change and a tune up about a year ago.

2 answers
Try cleaning the throttle body or have it cleaned.
Is the check engine light on? If so have the van scanned to check for
trouble codes.
As mentioned get it scanned at a shop see if you get any codes related to the torque converter lock-up solenoid (or TCCs). Possible lock-up clutch not dis-engaging properly at decel.