Sounds like your auto choke (if the engine has a carb) is not working properly. You need to verify its proper functioning, some are electrically heated (heating element opens it) and some are heated by the exhaust crossover in the intake manifold (like on pre-vortec V6 and V8s). It should nearly close with a cold engine and when it starts, the vaccum break should pull it open a fraction of an inch (but still mostly closed). Then when the engine warms up it should be all the way open. Are you opening the throttle all the way, before starting which allows the choke to close? Are you manually setting the cold fast idle by advancing the throttle about 1/3 forward in neutral?
Looking at OMC parts diagrams, I'm thinking you have a Ford 302 (5.0) and it likely has a 2 bbl Holley, or EFI. A '94 boat could have a '94 or 93 power train. In this case the engine is the same but the outdrive is completely different from the '93 to the '94. I am very familiar with carbs but have never worked on one of these marine EFI systems. That 2 bbl Holley has an electric choke. Sometimes all it needs is to clean the choke shaft and linkage, to allow it to move freely so it can close when cold and open when hot. On a boat that age you might have to replace the spring because it may have lost tension.
Post up your model number, then I can say for sure.
_________________ 88 Four Winns 200 Horizon 4.3 OMC Cobra-4bbl 2002 Walker Bay 10/2012 Suzuki 2.5 2008 Walker Bay 8
1998 Jeep Grand Cherokee 4.0/Selectrac 2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II
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