I would trace back to the engine replacement as from what you are describing all the issues appeared after that. Was the replacement done at a Chevy dealer? We have a 2015 also and it runs great. Sorry I can't offer more info, I'm not a mechanic. Good luck!
We needed a second car after selling my 2004 Vette. I did a ton of research for a decent vehicle and narrowed it down to the 2015 Equinox LT AWD. Bought it yesterday. The V6 306L SIDI engine was a new one for 2015, read a lot of good things about it. I used a couple of search references...
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