John deere kohler engine problem-

I have a LT155 that starts fine runs about 3/4 minutes then quits. Let it sit, starts up again, but won't keep running for any time. I just bought it, and have tried 3 times to mow the yard and no go. It even quit running without the mower engaged after a few minutes. Any ideas?

Sounds similar to problem I am having with LT160 with Kohler... does not quit if blades not engaged or moving but would under load.

Have replaced fuel filter, gas line, spark plug and checked flywheel key but haven't solved problem

Check the gas tank vent