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Ok, you have just done the engine swap. When I read your post, I thought the engine swap was awhile ago. I wasn't asking if the codes were there with the old engine, or the donor truk, just trying to figure out when the codes showed.

So, it appears that the codes started when the new engine was started.

The 43 is knock sensor, the 83 is low collant temps, probably because you removed the t-stat

Guessing you have a sensor/ECM in-compatibility (due to different years) problem.
 
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