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Start by checking the LP pressure at the tank regulator. It sounds like the mixture is too lean. The regulator may be failing as well. A check with a manometer can tell you this. That would be the first place I would start. Then get back to me if you need to delve further into this and we can go from there. All follow ups are included in our fee.
Just checking back in to see if that resolved this issue for you or do we still need to dig deeper into this?