Vehicle Shudder problems of the 2017 Hyundai Elantra

Purchased a Hyundai Elantra 2017 from a dealership on July 7, 2020. The 2nd day it stalled on me feeling like it's in neutral with engine light on. I returned to the dealership and they replace the ignition coil as and said they ordered a part to return in 2 wks. This had something to do with the airbag under the passenger seat. They kept the car another 2 weeks. I was happy when they called that it was ready. Each time I had to pay the 2 tolls to go to them in jersey. Before I got on the garden state good, the car started shaking, couldn't go over 45 mph with the engine light on again. I returned it. They kept it 2 weeks. I have my car with the engine light on still and called to complain but unable to reach a manager each time. I used up over $200 of toll money which I used up plus getting someone to take me to drop off or pick up the car had to pay for gas and toll. Produced the e-zpass receipts and everything and every time I go and ask for the refund, the owner is never there. I do not want to have my new car break down with me in the middle of winter. I requested a list of the things that were done to try to resolve the engine light issue several times even from the salesman who does not take my calls or when he does, he don't know what to tell me. Said he'll ask and get back to me. No response. The first day I paid for the car and we were happy to be going home, my daughter and I noticed the front bumper all broken up and it wasn't like that when we inspected and chose it before paying. The salesman sal said there's nothing he can do about that as I already paid for the car and must accept it that way. I brought it to a saleswoman attention the last time I went to pick up my car and they only said the manager/owner will reach out to me. Never heard from them. Still didn't receive plates. I feel like they took advantage of me as a senior citizen.

2017 Hyundai Elantra. Car is shaking heavily at idle, no codes or check engine light. No one will diagnose, turned away by dealership. When turning car will stall middle of intersection, this has happened twice. This is unsafe and dealership will not help me and I am turned away. I'm starting to worry about the safety of my car. I maintain it up to manufacturer standards. Transmission is clunky and not working well. No check engine light, no codes. Dealership and other mechanics will not look into issues. Transmission is sealed system but is in need of fluid change. Fluid is dirty and filled with metal at 55,000 miles. Other people complain of same issue at 35000 miles. Dealerships say this is a lifetime system and does not need service. This car is starting to seem unsafe. The amount of complaints on Hyundai forums to this nature should reflect some need to make the car not dangerous.

The car was purchased as a new car with 3 miles on the odometer from an authorized Hyundai dealership in June 2016. In August 2018, the car was driven for a little over 30,000 (highway)miles and was checked for the 30k-mile-service at the Hyundai dealership. The day after, engine check line turned on and the vehicle began shaking heavily in both high and low speed. Although I knew that the issue was related to the engine misfire, and was able to provide a obdii scan results from autozone, but the Hyundai dealership completely ignored all information I provided. In fact, they boasted about how well their "Hyundai scanners" are the only scanners that can correctly scan the vehicle. Consequently, I had to make four visits to the dealership within five days in order for them to admit their mistake and fix the problem. However, now the engine is still throttling in an unusual manner at a very subtle level. I spoke to the Hyundai's regional customer service manager about how this misfire could lead to dangerous situations on a highway where a driver's at a greater risk in higher speed traffic. But the response was simply advising me to continue visiting the dealership.