Car suddenly cuts out during highway cruising

[lethanh93]

I tried searching google and zilvia but haven't been able to figure out the issue.
Recently my ka24e 5 speed(s13) suddenly loses power and starts decelerating when I'm cruising on the highway. Quickly putting the clutch in and out temporarily gets rid of the problem but I'd like to fix it.
The problem is really random, it sometimes happens 3 times in a row or it might not happen for 200 miles of cruising. Might be coincidence but it hasn't happened while in any of the other gears, only 5th while on the highway.

Recent things that I've done on the car/ relevant? info:
-5 lug conversion all the way around, torqued everything to spec, used some junkyard z32 hubs for rear and aftermarket for the front. There isn't any play and all wheels spin freely off the ground.
-q45 front brakes
-wheels and tires
-speed sensor works intermittently but the gears look fine when I pulled them.

Any help would be appreciated.