It happened on Wednesday, November 6, on West 112th Street.
Authorities say the white BMW came quickly -- and with no warning -- seemingly making a beeline for the man and the young boy.
The car then backed up, and two men emerged. One man walked toward the victim, where police say he stabbed the father.
Both suspects got back in the car as a good Samaritan picked up the 8-year-old and carried him to safety.
Police say the victim survived and also left the scene, abandoning his son.
The boy is safe and did not suffer any serious injuries.
Police assume this was a targeted hit, possibly gang-related. They are now searching for three people: the victim and the men who tried to kill him -- and almost killed his son.
Anyone with information is asked to call NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA
* More Manhattan news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube