Well, I didn’t find a “smoking gun” but in the process of removing the intake tubes and going back through all of the vacuum junctions that I possibly could have knocked loose during the previous work I guess I seated something better and now I’m not getting the codes anymore. I went through everything that was reachable without removing the right intake manifold then I smoked it, found no leaks, buttoned it all back up and now I’ve driven it about 180 miles with several cold starts and the CEL/codes haven’t returned. So, I guess I won’t be pursing the ROW tune for now. I did find a couple of vendors online that would do it for about $500 with a bit of a performance tune to add a few HP and what not.
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