1999 Mercury 225 efi throttle issue

FishN-T

Cadet
Joined
Jun 18, 2010
Messages
29
Have Proline 25', twin 225's. Out Saturday and one engine when restarted, raced full throttle. Was turned off immediately.

Got home and with throttle cable off, muffs on, started and raced again so turned off immediately. What could cause this engine to be racing so extremely fast when started.
 
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