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Unsteady Idle

alparmer

New member
My Mercruiser MPI 5.0 is not idling properly. It will initially idle a bit low and go up and down until I increase RPM the. It will be nice and steady. I am assuming the IAC valve is going out. I ordered a new one. Is there anything else I should be checking as well.
 
The IAC valve my just be dirty and require a cleaning vs a replacement.

wouldn't hurt to make sure the throttle body fasteners are snug...

It's normal practice to 'scan' the ECU and make sure the vital parameters are in their 'normal' ranges if no DTCs are found.
 
Thanks for the tips. I’ll check the brittle body and IAC. No engine codes and everything is normal except the fluctuating speed at idle.
 
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