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  1. From what I've read online it seems that my 2005 Enzo SV230 has all the symptoms of a failed Idle Air Valve (IAV). It stumbles around idle coming out of gear quite often and sometimes even dies, and the only way to get the engine to start when its hot is to give it neutral throttle. After some reading online I ordered the Standard Motor Products AC423 Idle Air Control Valve of Amazon for $40 (In comparison to the $178 for the OEM Mercruiser 866326) which is supposed to be a direct replacement. Multiple people on Amazon said it worked perfect on their Mercruiser 350 Mag MPI so I figured it should work on mine! Of course when I received the part and went to install it I found a couple things that I'm not so sure about: The original part I removed (assuming it is OEM) does not appear to have a pin and spring in it that the new replacement part has. Anyone know the function of this, or if it is of any concern? The replacement part came with a small rubber gasket that is definitely not correct for this application; it appears as though it should be used in an application that has a machined groove more like an o-ring would have. After searching for the correct gasket online, all I seem to find pictures of is a simple thin sheet style gasket that is cut to the profile of the valve. The gasket I removed from the boat was pretty thick and is overmolded on a mesh screen material. I'm wondering why this screen would be necessary? Does it keep the foam filter (see question #3) from entering the valve? When I searched for the OEM replacement gasket I found that the original P/N 865168 was superseded by 866326... The notable thing here is that the part description of the gasket also changed from "Gasket, Flame Arrestor" to just plain "Gasket". Did they remove the screen from it for the new part? Once I removed the gasket I found a small foam filter (Mercruiser P/N 865266) in the bottom port of the intake air valve adapter body. Anyone know the function of this filter? Any air that is in the intake manifold has already passed through a much finer air filter so I don't understand it's purpose. I ask all these questions because I'm trying to get the boat water ready in time for the 4th, and I'm struggling to find the OEM gasket readily available.
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