I have a 2000 chevy blazer that has had a hiccup while driving above 1700 rpms. I have no service engine light on. I hand e checked my tps, map, distribator, pluggs and wires, fuel filter, fuel pump, and my injectors are fine. The issue happens more when I release my throttle.
I have seen that a lot of people have had this type of problem. My problem was a bad motor mounts. After getting that fixed my problem went away.

 

I'm experiencing this same issue. At low rpms i feel the whole motor jerk. Which mount(s) did you replace?

 

Both motor mounts. They are a little tricky to replace without removing the motor fully.