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It really is pain to do deal with. I would do what you did. Make sure you have gas to anything past the furnace and it works. I would go ahead and turn stove burner on low for the test. Take the panel covering the furnace off so you can hear what goes on with it. Not metal furnace cover. The decorative cover which probably has vents on it. Watch the furnace and listen for the click for the igniter and see if you hear it light. If it lights and runs a bit but then flame shuts off and continues with fan it could be a heat switch or regulator. The switch will shut flame off if it gets to hot. That pretty much rules out thermostat and igniter.
If it does not click like it is trying to light, it could be the igniter, regulator, board, or the thermostat. Thermostats usually have a fan on wire and one to ask for heat. You can check wires with a multimeter.
You could also have a blocked exhaust vent. If fan is not blowing with enough air off flame goes. Check for mice nest, although that is my first check. Mice chew wires, make nests, etc. Simple things first.
Not to many parts on them actually. Thermostat, fan, gas regulator, switches, control board, igniter. I have changed pretty much all the parts over time on our tt and coaches. Hardest part is if they put your furnace in a spot you cannot get to. Parts are available online of course for all of them. Amazon probably has them as well.
Nothing about it is to tough. Just a pain to go over everything. Kind of like the water heater. Pretty straightforward. Although water heater has no fan just on off instead of thermostat.
If you are handy with a multimeter. You can just turn gas off and look for current at the different electrical parts to see what is coming on or not.
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