What engine do you have?
please give all the info on the boat the you can as it helps us help you.
The carb you have is an Endelbrock 1409 with is a marine carb.
I do not think that there is a port that you can attach a vacuum gauge.
The two screws on the front at base of carb are the idle mixture screws, with the engine off turn them in all the way till they bottom out lightly (DO NOT TIGHTEN THEM AS YOU WILL DAMAGE THEM, ONLY LIGHTLY) . Then turn them out 1 1/2turns, you should be able to start engine and let it warm up before you do any more adjwsusting of these screws. turn each one a little untill engine runs smooth and check for correct idle speed and readjust as needed.
Don
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1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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