K11 IDLE (THROTTLE BODY PROBLEM)

Hi guys, I from Turkey. I have a k11 96 model 1.3 which is changed from automatic transmission to manuel from before owner. When I clean my throttle body. I get a problem. I try many thinks but nothing get yet. I decide to ask you prof. My idle get up like 300rpm when is slowing my car under 20km on neutral position. It could be about automatic tb or not? If you have any other suggestion let me know.

Thanks.
 
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