Df140tx High revving Idle.

[keake]

I recently had water in my fuel in my suziDf140tx engines. I then replaced the high pressure fuel pump,regulator and injectors and after putting engine back together,the rev's were rather high for idle (2200-2400rpm) I can plane the boat with both engines but this engine will only go to 4000rpm,anymore and it starts to surge up & down and loses power. Can someone please help me as we have pulled the manifold off again and can't see anything,like a pinched hose,etc. cheers

[boats.net]

The high idle usually means an intake air leak, check intake gasket and throttle body gasket.

[JUST-IN-TIME]

just use carb cleaner and see if rpm changes, other than that a iac valve needs to be clean

[keake]

Thanks for the replies,I managed to find the problem and it was that valve,
I carby cleaned it and put it back in and it was all good.Thanks for your help.

[keake]

Now my engine struggles to idle when I bring it back from running. It usually just dies when I slow down and I now have to put extra revs when I start the boat. Could it be the same problem-IAC valve? Any way to fix?or just replace.