My wh experience is to blow out the tube between the gas regulator and valve and the orifice at the burner. That has fixed mine several times when it was working erratically.
It does not take much of a cob web or dead spider to cause that situation.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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