150 EFI Mid Range Surging

btm1

Recruit
Joined
May 19, 2008
Messages
2
I have a 2000 Mercury 150 EFI. It idles fine and at WOT is runs perfectly. In the mid-range it has a extreme surge. With a steady throttle setting it will slow down, then speed up, continuously.

The motor has had new plugs installed, injectors cleaned, water filter replaced, both voltage regulators were replaced. The battery is a new Optima and is fully charged.

Can anyone point me in the right direction?

Thanks,
 
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