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Attachments are working again! Check out this thread for more details and to report any other bugs.
I am no expert but newbie with similar symptoms. At 218k on a 2010 with start up knocks I cleaned egr and intake manifold with Purple Power found...
Mendel, thank you for all your informative posts. I like others have been inspired by the GM video to do my own HG replacement on my 2010 Prius...