Small Engines (Lawn Mowers, etc.): engine dies when engaging blades, mtd yard machine, carburator

Question
I have a mtd yard machine-tecumseh enduro 12.5 hp 38" cut-2000 model-riding mower. Recently, thengine would would run fine low anf high thriottle but start missing when blades engaged.Sometimes it would straightne itself out-sometimes not. It kept getting worse. I put carb kit,fuel filter,drained tank put in new gas. It would still miss some when engaging but not nearly as bad. Now it dies almost immediately when I try to engage blades. I looked for a safety switch to bypass but couldn't find one. Please advise if you will.  DC

Answer
 Hello D.C.:

 Did you Soak the Carburator Overnight in Cleaning Solution(Gunk Carburator Cleaner)? Did you Blow Out the Passages with Compressed Air? If you Used Spray Carburator Cleaner it just Loosened the Varnish. Send me the Model Numbers Off of the Mower and the Make, Model, Type and Code Numbers Off of the Engine, Please. With these Numbers I can Locate a Breakdown of the Engine and Mower and Better Assist you. Hope this Helps. I am here if you Require more Assistance. Let me know what Happens, Please. Thanks.

 Good Luck

 Respectfully

 John