My t1000 had a bad carburetor, I replaced it with a new Kohler(exact match). Mower won't start. Sometimes it will run at a very low rpm, sometimes it coughs and sputters. New plug, new air filter, new oil, filter, new gas, new gas filter. What am I missing??

Sounds like the air mixture screw needs adjustment

Hi,
Check the flywheel key.
Peace,
Clarke