This is a 7FGCU30 with a little over 30,000 hrs. When it is warmed up it starts and idles fine. When it is cold there is only one way to start it. I disconnect the LP line from the tank, evacuate the fuel from the system, and reconnect the line to the tank. Then I spray some carb cleaner in the mixer. Then, with my foot on the accelerator pedal, I spin it over and it will start. Before it dies I will open the valve on the LP tank. It will remain running as long as I keep my foot on the pedal. Once it has warmed up I can take my foot off the pedal and it will idle on its own. If I take my foot off too soon it will die and I have to repeat this process. Any ideas if this is in the mixer or in the regulator. TIA