I had the SAME problem
I am still not sure what exactly fixed it, but I do remember replacing my valve springs, and lifters not too long afterwards.
I do think it is just that that bank had mostly compressed lifters, if U were to take the lifters out and soak them in oil overnight, and try adjusting them U will not see that again (at least for that time) I don't think it is necesary for that though. Just adjust it the right way (all I did) and it should be fine. I would suggest replacing your lifters if they are still stock or over 50-60g miles (cheap enough insurance).
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Black SN95
TFS heads, Holley intake, AFM B-2 cam,
12.9 @110mph best ET
13.06 @111mph best MPH After gutting out clogged cats and a much better tune. Took Nitrous out for warranty work  didn't have time to put back in for track.
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