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350 Mariner Port Engine over heats at idle


I have searched the post but have not been able to find anything that helps as of yet. My problem is that my port engine over heats when I am in gear at an idle, temperature shoots up pass 200 degrees and I have to shut it down. To date this is what I have done.
Raw water side:
Rebuilt Raw water pump, flushed Transmission cooler, Had the heat exchanger removed cleaned tested and re-installed & flushed the raw water system.
Closed loop side:
Replaced thermostat, flushed and replaced antifreeze.

Flushed and changed oil in both engine and transmission.

The unusual thing is it only happens some time and only when I am in gear and at idle to dock or anchour, as soon as I bring the rpms up to 1000 it cools right down to 165. Any help will be great.

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