500 HP Intermiten Idle Issue
 

I have a 2003 Powerquest with 500 HPS: (500 EFI's)


* Intermittingly the starboard engine revs to 1500 RPM (I shut the engine off restart - issue goes away) It will stay at 1500 RPM and will not drop down

* I can be running the boat all day and then when I come off plane - the same issue occurs (Shut to engine down - issue goes away)

* It will happen at no specific time

* I have replaced the batteries, check the battery connections and ground connections

* The ECM modules have been tuned by Arizona speed about 6 yrs. ago

Comments / Possible solutions / Feedback is greatly appreciated

Regards,

Walzman

500EFI's ?

Intermittent vacuum leak will cause high idle on EFI motors.

Yes 500 EFI's