Engine engine shuts down with pto

I have a 08 conquest 23hp Briggs. Engine runs fine until pto is engaged then shuts down. I have checked the reverse pedal, cruse switch,pedal switch, rmo, all seem to work fine. When I engage pto there is still spark all the down to zero rpm (I put a tester on plug wire) so power is not cut off to plugs. When I restart,it needs to crank a lot (cylinders are flooded) so it did not shut off fuel. Also with engine not running, probed power line for fuel shut off (to power supply) with key on then engage pto, power remains on. WHAT TO TRY NEXT? Any ideas out there?

Engine engine shuts down with pto