I went t the mechanic for the check engine light on which was related to the secondary air pump (other complaint made.. but the pump works great).

Then, the mechanic tells me that I have misfire in cylinder no.3. He can see it from a code related to the check engine light. He said I can feel that the car 'is not taking his gas' and it slows to accelerate. I experienced it a few time since I had the car.

I'm waiting for my other appointment for the official diagnostic and if it is covered, the warranty will pay for the repairs.

My experience with Volkswagen has been awful! My Tiguan 2018 was only 4 months old with 4,206 miles on it, brand new. The car suddenly stopped with the car running on the highway. I had to call VW for road assistance and two days later I was informed that the engine had to be replaced. I expressed that I did not want the vehicle anymore, that I wanted a brand new car due to the unclear problems that arose. As for the dealer's service, very disappointing as well. I was given a sedan as my replacement even after I stated that I am disabled and unable to bend down in the car. To this day, I still have not received the SUV that was promised to me.

Update from Feb 16, 2019: Before the car had an issues, I noticed there was a lag in acceleration. I am unaware if the issue comes from the transmission or any other case.