Well thats great news
I am no closer to solving this on my end either and getting tired of this damn mystery machine.
I don't understand why this car throws a reduce power warning and doesn't give it a CEL to diagnose makes no sense whatsoever.
I have to replace my power steering pump and reservoir, solve an oil leak somewhere near the oil filter housing ( I think it is a pressure sensor leaking but not entirely sure need to remove the skid plate to investigate better ), replace the bank 1 air intake pipe and refresh my cooling system.
While I'm doing this I'm going to replace all vacuum lines and hopefully clear this up ... if not I'm going to start considering selling this money pit of problems.