[captahab80]

While cutting my grass today my LT133 stalled out like it was running out of gas.While trying to re start it the engine kept backfiring.After I got it started it would run fine till I engaged the mower then it did the same thing.So I cleaned the carb bowel out started right up put the mower in gear and it started to die.

 

[Mark / Ohio]

Welcome captahab80!

Weak spark might be another possibility. First of course try a new spark plug. Seems I recall others having some issues with the ignition module causing similar symptoms under load. Also since it is shutting down when engaging the blades you could have something going on in the safety shutdown switch circuits.