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Let the engine warm up for a couple of minutes and see if it will run with the choke off. I have a couple of small engines which crank well and won't run cold but do OK after I let them warm up a bit. Normally I would say you have a carb problem with gas not getting from the carb bowl, into the jet and into the engine. Your engine being new it could still be a problem. All the air coming into an engine is supposed to come thru the carb. If you have air leaking in from somewhere else then to get the air/fuel correct enough to run you are having to close the choke. Check for leaks by cranking the engine and doing a quick spray of carb cleaner all around the mounting areas but not near the air intake. If there is an air leak the engine will respond by changing rpm. If you don't find an air leak, it's the carb.
you blew your head gasket, water leaking into cylinder, when you let the car sit, it cools water seeps into cylinder. you drive it around it warms up, water evaporates, the metal expands due to heat. water stops leaking into cylinder and car feels to run normal again.
The solenoid on the bottom is a fuel shut off solenoid to prevent backfiring if shutting down engine with the throttle still open. If you're leaking fuel into the engine, the float is not closing the needle valve in the carb. remove fuel bowl and replace float, and needle valve with seat.Be sure to blow out all fuel passages
With a good air filter, and a good fuel filter you shouldn't really have any problems since the fuel pump is good. You could have a vacuum leak, this can be identified by using a can of carb. cleaner with the tube attached so that you can spray near & around your vacuum hoses & connections. If you spray near a leaking hose, or a cap, or connection that is leaking, the engine will slow or stall. Only spray a second or two & allow the engine compartment to air out between spraying as it is a flamable product.
Short of that, you could be looking at ta idle speed control motor/throttle position sensor.
Testing the vehicle with a vacuum gauge could assist in identifying any other issues such as exhaust or valves. Gauges usually come with instructions & just need to be hooked to an available intake port.
the float may b sticking...depending on what type of carb ur running...the spit and sputter problem sounds like you are running a keean carb and if thats the case...there is a extra setting on those that is leaded in from the factory that your average joe doesnt know about...have someone familiar with this adjust it for you and that will help some ...however if itis a keean either live with it or change carbs...that spit you described is just how they operate
Sounds like somewhere you have a air leak. Most likely it's somewhere near the carburetor intake or maybe the carb itself. Could be a line from the primer if it has one and i do believe it should that could be leaking or loose. Good luck.