What could be wrong with my 2003 ford e250 van?

I have a 2003 e250 van ford and it is showing the abs light only. Now the way my car is acting is its sputtering on and off like it comes and it goes also while i was driving i went to hit the brake the brake got hard and pulled to the right the abs light came on and now she's sputtering on and off

A 15 year old van? Bring it to a mechanic.

What?

Trade it in for a decent car.

You need new brakes! ABS is the anit-lock brake system! Simple fix, overhaul the brakes using the correct parts.
That fixes problem with the ABS light… The sputtering and bad running is a totally different issue!

You have. 2 issues .abs fault ( operating one side only?) and engine issues that can be many things. Here a diagnostic check. Can pinpoint areas of concern.
sounds as though vehicle needs attention of a trained mechanic/technician. Especially if it has not been regularly serviced! Brakes are v important so get checked out as soon as possible.
engine issues will cost. $ but potentially far more by not sorting now.