I've got a problem with a gas oven in my trailer.  Background:  I've got
an old 5th wheel with an old stove/oven with parts no longer available.
 The stove works great and there are no leaks in the whole appliance.
I've tested it twice recently with new supply pipes (several months ago)
and found it secure again.  The oven was working fine up until recently
( a steady flame for cooking).

The problem that is now happening is that my oven burner no longer has a
steady flame.  The pilot stays lit, but the burner tube that dispurses
the burning gas underneath the bottom part of the oven doesn't have a
steady stream of gas.  It will light, then 2-3 seconds later will burn
out, then 2-3 seconds, it will dispurse gas and light up again from the
pilot light.  This cycles through regularly for about 10 cycles then
stops completely for about 10 seconds, then starts over again. and when
it returns, it doesn't stay lit for more than 2-3 seconds before it goes
out and cycles through just like before.

The pilot stays on all this time and so when gas comes, it is able to
still light the burner tube gas being dispensed.
I'm wondering why it's not staying lit with a steady flame.

The stove works fine with no problems, so I don't think the problem is
in the regulator on the tank.  I've not had it do this before when I
cook with the oven.  I'm wondering if the oven thermostat is messed up
or if there could be a part in the oven mechanism itself, near the gas
dispensing tube, that might contribute to it.  I don't think it's a
normal operating procedure i.e. the thermostat controlling temperature,
because the oven temperature doesn't get hot enough.

My first thought was the regulator, but the stove works fine with no
variation in gas levels while burning and the pilot light in the oven
doesn't go out.

Has anyone had this kind of problem?  Any thoughts on what solution I
could try?

It's an old Magic Chef gas oven.

Jodie S.