A 38-year-old man was stabbed in the back in Midtown early Friday after he began recording a road rage-fueled fight between two strangers, police said.

The victim was near the corner of Seventh Ave. and W. 49th St. just before 6:10 a.m. when a white Jeep and another vehicle nearly collided.

The two drivers — one a 25-year-old man, the other a man between 35 and 40 — jumped out of their vehicles and began arguing, cops were told.

The curious victim began recording the exchange, only to be attacked by the older man involved in the road rage incident , cops said.

During the scuffle, the suspect jammed a bladed object into the amateur videographer’s back before jumping into his Jeep and speeding off. He was last seen heading west on W. 49th St., cops said.

Someone called 911, but th

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