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99' 496 efi rough at idle then clears up

729 views 0 replies 1 participant last post by  SoCal Scot 
#1 ·
Hi guys,
My brother has a 1999 28' nordic with a 496 efi engine. When you start it up hot or cold it runs rough but, as soon as you give it some throttle it seems to clear up and run fine. He took it to a shop in Havasu for outdrive service and after servicing it he told him that it sounded like something might be loose in the top end. I did some googling and everything related pointed at the map or iac sensors... We have NO efi knowledge to speak of but, we turn old school wrenches well enough. Do the 496's have any common upper end issues that we might start with or should we start with a scanner guy first? Boat is near Angels Stadium in SoCal.

Thank you!
 
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