replacement engine even available?

[Hklinker]

I doubt you need a new engine. It sounds as if the engine is mechanically sound. But to be sure, do a compression check immediately after the engine quits. If it is good, and it isn't bellowing smoke out of the exhaust, then you've got a fuel delivery or spark issue. You may need nothing more than a carb rebuild or ignition module.

I agree w/mullins87, sounds like it may be a fuel issue. An established local dealer may still have some Tecumseh parts. A good carburetor cleaning may do the trick.

Good luck!