Nissan LD28 - Idling Erratically and Blowing Smoke

My LD28 is smoking a lot and idling erratically. Any suggestions what may be causing this and what would be the best course of action.

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My LD28 is smoking a lot and idling erratically. Any suggestions what may be causing this and what would be the best course of action.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

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