2003 J175GLSTA surging?

[Les Young]

I’ve replaced stator, optical sensor, power pack, plugs, wire’s, coils & rebuilt vro. All because of slow idle & weak holeshot. Now it has started surging. Any idea what may cause this? Thanks

 

[racerone]

Test run with another portable tank and hose.

 

[Les Young]

Thanks. I'm going to borrow one to see what happens. What exactly am i looking for?