OMC cobra 5.0 efi surging in idle

[Kameron2]

hello everyone I have a 97 reinell with an OMC cobra 5.0 efi and when I start it up it will run good for about 30 seconds to 1 minute then the idle starts to jump up and down and gets more intense until eventually I just turn off the boat. But if I put the boat in drive it will drive okay as long as I’m on the gas. I changed the impeller but I’m kinda stuck have no idea what to look into next

 

[Scott Danforth]

Test your IAC

 

[Kameron2]

Where is that located ?

 

[Kameron2]

Test your IAC

How do I test the iac

 

[Scott Danforth]

How do I test the iac

It's in the factory service manual

Original outboard product and service manuals for Johnson, Evinrude, Gale, and OMC

Ken Cook Co. sells Original Product Literature Supporting 1996 and Older Outboard Marine Corporation Products, limited supply of original printings of Johnson, Evinrude, Gale, and OMC manuals are still available. On older literature, we may provide a machine copy reproduced from a master file...

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[Kameron2]

Test your IAC

Where is it located?

 

[Scott Danforth]

Where is it located?

Read the manual

 

[Lou C]

Manual = real learning