Enclosed are 3 pics of this for the pressure washer engine. If I mount this in place the only way it starts with or without the choke is with a little shot of starting fluid. Once started the governor hunts slightly and it idles rough. Take it off and it starts fine with choke, runs smoothly and idles smoothly. This is not covering any ports/ openings on the carb flange. Really has me scratching my head. Any answers/advice??