RV motor won't stay running

I don't think a 2001 Winnebago has a carburetor.
When you sprayed starter fluid into the intake, did the engine fire?

How much fuel is in the tank?

we have probably 1/2 tank or more. Does anyone know where the fuel filter is on my model? I'm going through all my books to see if I have anything that shows it. Thanks for the quick reply.

It did fire but wouldn't continue. Sorry I didn't include that in my first reply.

On my rigs past, there was a fuel filter located inside the frame rail on the drivers side. You need a special little tool to unlock the tabs. All the auto parts stores sell them. There is also a filter sock located on the in tank pump that could be clogged also. You can test the fuel pressure at the fuel injector rail. But I would put a new fuel filter on it first, and if no good, then test for pressure, if still no good you might need a new in tank fuel pump. Have someone turn the key to on while you listen down at the tank, you should here the pump hum, if not that may be your culprit.

Can you jack up the rear to get it more level? I don't know where the fuel pickup is in the tank.
The fuel pump is another item to consider.

How old is your gas? And did you put stabilizer in it at the end of last camping season?

Thanks again for all the responses. Appreciate the suggestions. It's getting dark so we have to quit for the night. We'll try some of the things pointed out. I'll try to post the outcome.

the gas was put in last fall and we used lucas gas treatment.

It should have a fuel pump relay that turns on when you have oil pressure.
It will cycle the pump for a few seconds when you first turn the key on.
You need to turn the key on and off to get the pressure up.
If you listen at the tank when key is first turned on you should be able to hear the pump.

Lucas makes a fuel treatment which is a lubricator/cleaner and they also make a fuel stabilizer. Two different products.
It could be the gas.
If its not fuel related or fuel pump/fuel filter related then other possibilities could be as follows. BTW, fuel filters usually show they are dirty when the vehicle won't perform under load or high speed.

(I'm not a schooled mechanic but I was able to ask one)

Does the vehicle run if you leave your foot on the gas pedal so the rpm's increase ? If you let off the gas and allow it to return to idle, will it then shut off ? If so, suggest to the mechanic to look into the idle air control valve.

Also:
Ignition modules function in two modes. The start and run modes. During the start mode, the ignition module allows full voltage to the coil(s). Once the engine starts, the ignition switch moves to the run position, the ignition module drops the voltage to the coil(s). If that would occur w/o reducing the voltage the secondary components would burn out in the run mode.