engine will not run smoothly

[Gene1949]

The OP has a fuel problem.
Since we got drug down the “hate on Pentronix” rabbit hole the 1st question that should be asked, “Are you running a generator or a modern-day alternator”. And I don’t mean a conversion (fake generator) or a 1 wire job but a real factory alternator WIRED CORRECTLY (sensor wire).
Electronics do not like voltage spikes common to a generator. Besides, the complaints here are pretty minimal compared to the many 1000s in service.