01 Rancher 350 Fm that is doing something unusual

When revving up past 3/4 throttle or so you can see that it pulls
a stream of fuel through the primer spraybar on rear of the carburetor.
It squirts a stream of fuel just like it does when you push the plunger to prime it.
It will pulse a stream if you rev it up and down or a continuous stream if you hold it above 3/4 throttle.
Needless to say its quite eye watering RICH when doing this
I wanted to see if anyone has seen this before and where might start to look first-Carburetor is really clean, primer works well, idles ok
Any and all help appreciated
I will be sure to update here with solution when corrected
Thanks for a super helpful forum