Husquvarna 1538 , why does it run this way

Kohler CV15 s This Kohler was surging bad not running well. Here we go through the steps i took to make the Husquvarna run good.Carburator repair,
The Husquvarna 1538 suffered from bad fuel , old fuel. The ethonal in fuel creates many issues. Fuel gel. Clean kohler carburator.