GT-40 Idle issue

[jc]

So just picked a 95 SNOB, first couple times out I noticed it seems to idle quite high on start up.
When it fires up it revs up to around 2000 rpm for about 5-10 seconds then Idles back down to 1000.
At first I thought it was perfect pass related but I’ve ruled that out. Also happens warm or cold and I need to wait 5-10 seconds to idle down before I put the boat in gear.
Was a California boat now living in Alberta Canada.
Thoughts? Throttle position sensor? I’ve owned a few GT-40 boats and never had this issue before.
Thanks in advance!

[jc]

Anyone?
Any ideas?

[windsurfnut]

I'm new to the GT-40, but in my experience a bad/failing IAC (idle air control) valve show these symptoms.

[Tom_H]

I would say either an IAC issue, or check your throttle cable and make sure it's not leaving the butterfly open a little bit in neutral, causing the IAC to take some time to meter it down from its start position because of excess air getting in.

[jc]

Yes this would make sense. ill have a look this weekend.
Thanks