So I adore my Soul, but there's one problem: the engine idles quite harsh at a stop. It's so bad that the entire car shakes. Now, a little while after I got my Soul, an oil change shop screwed up big time and the entire engine locked up due to an oil plug that wasn't tightened. At the time, the engine was replaced at the dealer with a brand new engine. I'm guessing it was in 2018. Anyway, I ran Techron through it to clean the fuel system, which seemed to help a little, but I was stumped as to what to do next. I'd take it to the dealership, but I've had the worst customer service there lately as it has deteriorated dramatically. They have confused me with other consumers and do not appear to understand what is going on. Any ideas on what the problem could be and what steps to take? I adore my Kia and only want her to perform to the best of her abilities.
Thanks In Advance.