not many stupid questions here, just stupid replies!
and here's one...
did you turn ON the lp gas at the tank valve?
even IF the gas is on at the tank the lines may be empty,
the furnace isn't affected by winterizing but it may not ignite IF there is air in the lpgas line.
so turn on the tanks and light the range burners briefly.
the furnace will now need to be shut OFF completely (turn the thermostat OFF) for a few minutes to reset.
turn the thermostat back on, then try the furnace again.
the ignitor should work now, with hot air blowing soon after ignition.
all of the true things that i am about to tell you are shameless lies. l.b.j.
we are here on earth to fart around. don't let anybody tell you any different. k.v.