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Penta44 low revs

I have a strange problem with a pair of KAD44EDC engines.They went into a sort of limp home mode a few months ago and will not rev past 1100 rpm either in gear or neutral,fuel system has been checked(seperate for each motor] and bypassed with a hose from a 5 gallon can,filters are new,air filters fine,no black smoke,starting is ok and they hold the revs they have without hunting, so it seems to me to be a control problem,I have checked the EDC consol for fault codes and recalibrated the throttles all to no avail.This has to be something in common with both as they went at the same time but I am at a loss at the moment.Does anyone out there have a schematic diagram for these things or know what to look for next?
Any help would be much appreciated,
Simon.
 
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