Guys, i know this is an old thread but i also am having the exact same problem but on my drivers side. i will attach my data log and see if anyone has any suggestions. i have replaced both o2 sensors with Delco's, new IAC. i also have an obvious miss to. my tune is from Soloman and this was his comment after reviewing my data log.."You’ve got a major issue on the driver’s side, it’s max rich at idle. I’d guess your injectors are leaky on that side or some other issue causing bad combustion." i have tested my injectors both OHM and by pulling the fuel rails up and priming the system and there is no leaks, maybe i just need to put my factory 24# injectors back on. Thanks everyone!