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NNBS 4.8 tsp220R idle issue


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I'm just trying to figure this out. I have an 07 NNBS Sierra RCSB 4.8 that I did a tsp220r swap on. Also did the trunion upgrade and am running a BB tune.

 

So, I'm not entirely happy with the way this idles. Sometimes you cant even tell it has a cam. Every 10 seconds or so, it will cycle and the idle smooths to almost stock. It will idle perfectly smooth for about 10-15 seconds, then chop for about 5-10 seconds, then idle perfectly smooth again. Does anyone know what circuit is cycling to cause the idle to smooth out? It drives me nuts!

 

Sent from my SM-G925V using Tapatalk

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