I bought my 96 e150 last week, and after a few miles the ABS light comes on, the brakes work great...any suggestions

 

Probably a bad wheel sensor.

 

Suggestion, buy a OBD II scanner and let it tell you why the light came on. I paid about $200 for an OBD II scanner with ABS. Worth every penny. The most likely cause is one of the front sensors. The scan will tell you which one.