Ok so I caused my own problem by buying a used rider without trying out the deck.
I just bought a Craftsman LT1000 mower, it has the kohler 17 HP Model 3 CV460s.
It seemed to start up and run fine, the motor at full throttle did not seem to race very much but I just assumed that was normal. Drove it out to the road drove up the ramps no problem. Got home started right up unloaded it and went to mow the lawn. As soon as I engage the blades the engine bogs down almost stalls. Checked for a bad deck bearing everything turns easy. It acts like its not getting enough fuel so I pulled the carb off to clean it. Checked the plunger it snaps in and out while cycling power as it should. cleaned and blew out passages in carb runs the same even ran it for a minute without the airfilter just to see if it would make a difference it did not, It backfires through exhaust and pops back out the carb occasionally and I also noticed that it looks like it is actually blowing a little gas out of the carb when running low rpm's just off idle