After starting car it sputters and white smoke from exhast. I drive the car for 5 min, sputtering the whole time, and turn it off - will not start until it is cranked and gas pressed for couple min. Then after getting started it will sputter until it is running for about 10 min and then runs fine.

Your head gasket has a break in it,and ,or a cracked head. Be careful
not to let the engine overheat,and cause severe engine damage. I'd
suggest not using the vehicle,until you have it repaired. Good luck.

So this only happens when the vehicle sits overnight or for a few hours? Either way have a compression test done sounds like you may have a bad head gasket, or valve seals. White/blue smoke oil burning, white/grey coolant, black smoke, is a fuel problem.

White smoke is usually from water and water will make the car splutter. Did you get water in your tank at some time. If you have water in your fuel, you will have to drain the tank and refill with good fuel. The engine will run fine once it is hot but if a lot of water goes into a hot cylinder it can cause a lot of damage.