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possibly the Idle Air Control valve. Might be what Iggy is referring to above. It's a solenoid plunger that moves in and out of the throttle body to regulate amount of air going in, and if faulty can cause idle RPM issues.

Thanks Wingnut. No carb though. This is an EFI engine.

The Chaparralboats.com website does still have parts guides that show locations and part numbers for items on many boat models going back to 2002. And your 2003 Signature 350 is there. Check it out: https://www.chaparralboats.com/publications/uploaded_files/partGuides/Signature/2003/350.pdf

Hi all, great to have a forum to go to now that the Chaparral site has shut down! I'm getting ready to replace the exhaust manifolds and elbows on my 2000 205 sse with Mercruiser 5.0L EFI engine s/n 0L699446 and was wondering what the purpose is of the exhaust tube p/n 865100A01. This is a...