Question:

We have a 99' 4.0 mercruiser and when u start it wont idle below 900 rpms but will rev up but wont plane out

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Any ideas?

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  1. Sounds to me like its ready for a complete tune up, including Dist cap and wires


  2. sounds  like you  have  carb  problems  .

  3. Idle is fuel delivery or timing issue.

    Rev-up but no plane?....make sure the gearbox hasn't blown a seal and gotten water in it. You can seize the gearbox if it is leaking and it's a big power robber.

    The gearbox oil will be milky...bad...get to a tech. ASAP.
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