In alt.home.repair, on Fri, 23 Feb 2018 16:55:36 -0800, ultred ragnusen
wrote:

Terry Coombs wrote:

* It's called surging , and it's caused most often by clogged fuel
passages in the idle circuit or an improperly adjusted idle mixture
screw . But mostly the former . .

Thanks for that word because it's apropos that the engine is idling and
surging periodically.

I don't think either of these California engines have an idle mixture
screw, as the engines are only about three or four years old, so it must be
the clogged passageways of the fuel passages.

And don't you think Sta-Bil might have prevented that?

That's why people use it.

I guess, in that case, Seafoam may be the trick as someone suggested.
Do you concur?

Or would you just run a few tanks of fuel?