We had a fruitless discussion and then he started many of his comments with "50,000 idiots on the Forum", this and that, and I restated that I wanted a steetable tune without going Open Loop. He agreed to take a look again.
He ran a smoke test (?) and validated that were no vacuum leaks and the FAST intake was sealed well. There also didn't appear to be any exhaust leaks, at least up to the cats.
What he did notice was the PCM was continually adding fuel to the drivers side because the O2 was reading lean. This is why after a short time it was running so rich and having idle and start issues.
He commented that the issue could be the length of the LGM LTs and placement of the O2 sensors which he does not prefer and then stated that he seen more rwhp with the Kooks. I don't think that would only effect one side of the engine.
Could be the O2s, but he replaced them with the H/C upgrade.
Could be the lifters, but they were replace also.
Could be the coil packs, he replaced #2 and #3 with the H/C upgrade.
He suggested that we replace the remaining 6 coil packs and see if that fixed the problem.
I would hope that there would be a more diagnostic resolution that would isolate the weak link without just replacing stuff.