Brought Dart to shop to fix idling issue and car runs like s**t!

Love the As,
Rusty is right. Find another shop. I know its convenient to have a shop in CT, but not everyone is cutout for these types of diagnosing and repairs, especially Mopar. Of course they will talk a good game as they take your money.
Ask around.
When I was in need of a resto shop, I kept hearing "take it to Gary's". Now Gary was in PA, over 4 hours from me, but it was worth the inconvenience of trailering my Mopar all the way over there.
Nothing better than dealing with a "like minded" Mopar oriented guy who has the knowledge and connections to get through the tricky cases. Dealing with a guy thats not in it just for the money?...priceless.