Another possible issue is a leaky injector. I've never had it happen on a Pathy, but on an old Grand Am my dad had it would be hard to start, and run like crap if you shut it off for say 10-30 minutes and tried to start it again. Any longer, it was fine, any shorter, it was fine.
Basically, in less than 10 minutes the leaky injector couldn't flood the engine, in 10-30 it would, and after 30 minutes the pressure in the fuel lines had dissipated enough that it wasn't leaking, and what had leaked out would either flow past the seals, or evaporate.