Everytime I let it sit for a few weeks it runs like crap for about the first hour of driving. It stumbles and farts and spits out oil.

Runs so much better when I drive it like twice a week. Then it runs better then my regular car. Smooth and no oil burn...

Have you tried pulling the gas tank? It is probably full of crap. There is a screen in the bottom of the tank that is clogged easily. Driving around stirs everthing up and let gas flow by screen. You may even have water in the gas from condensation depending where car is parked and what the weather is doing.

It's the gas. Any place that can be exposed to air will let the liquid evaporate and you get this vaseline like sludge and it takes a while for it to be flushed through the engine by fresh gas. Try some sta-bil or something similar?