This could be caused by several things but the most logical is vapor lock. The unit should have a vented gas cap, try running with about 1/2 tank or so with gas cap off or just barely on, if this affects it causing it to run proper your problem is just a clogged vent in the fuel cap.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/steve_f5a6ca85b5d1ffc9
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