Cutting out/studdering at 3k-4k

[4g63tcrazy]

Haha yea it's been in the back of my mind this whole time. Cause all I changed since the car ran last was valve springs, valve stem seals, resurfaced head with a composite headgasket, and cleaning up the wiring harness. So unless a sensor decided to go bad within that amount time the only thing it could really be is the wiring harness. My car ran perfect before I had to pull the head off.