Hello I have a 19 year Monessen vented gas fireplace. The pilot light was staying lit, the firplace ran for about 10 mins then it would click and turn off. I replaced the gas valve, the gas regulator, and the thermopile/ignition coil etc with new parts. Now I can light the pilot light but it will not stay lit, turns off as soon as I let go. I tried playing with the pilot light adjuster/screw to no avail. I have no clue as I figured the only 3 working parts were replaced. Any suggestions? Thank you.