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Mercury 225 efi runs rough below 1800 rpm

I have a pair of 225 efi 2002 both run bad below 1800 rpm. They shake the boat! Above 1800 they are smooth and strong. Top rpm is 5700. All maintenance has been completed by dealer. Compression is good on all cylinders. Dealer said motors were very strong on the dyno.
motors are charging 13.5 at the batteries.
I have searched the posts and see other people have had this problem, but I don't see where they said what fix the problem on there motors.
Any help would be greatly appreciated.
 
Could be failing CDM module/s, TPI, MAP sensor or [FONT=Verdana, geneva, lucida, lucida grande, arial, helvetica, sans-serif]broken reed.[/FONT]
 
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