I have a buck stove nat gas insert. I have no idea how old it is. it is vented and it is a steel plate type unit. it utilizes a powerpile millivolt gas valve. It holds a pilot fine, and it will run fine for a little while and then it will drop out the main burner for no reason. sometimes i can wiggle the wires on the valve and she will start right up again for a while. other times it will work if i shut off the auto/off/manual switch and turn it back on. i tried cleaning the wire connections at the gas valve, to see if i had a bad connection, and it didn't work any better. could the powerpile be getting weak with age? i tried to test it with a meter, but i am not sure what to set the meter to. It is a cheap meter, may not be the right one for the job. any help guys?