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That sounds like an LP pressure problem at the tank regulator. That should be checked and adjusted at least once a year and is often neglected. That would be the first place to start. Most shops have a manometer that they can use to check this. Once that is eliminated, we can dig deeper into this. All follow ups are included in our fee.
Just checking back in to see if you got this resolved or do you still need some help and additional input from me here?
O.K.....or if you need a new one, I would go with a Marshall unit. Best on the market I think.