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Holy crap people - just stumbled on what could be the fix. Two more pieces to the puzzle - I have an Automatic and I'm also having stalling issues that my tuner can't figure out.
I found out that Automatics have a vacuum pump on the passenger side cam cover that feeds the brake booster. Not only does this bad vacuum pump sound like bad rockers in the head, it also causes idle stalling issues.
$160 pump ordered which I will install on Wed or Thur when I get it. Best news of the day (hopefully)!
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