NHTSA Complaint #11418200 — 2020 CHEVROLET MALIBU

*First incident: Unknown. Could have been stranded. Not confirmed by dealership. First appeared on 5-20-21. I started car. After car started, the cars body started to shake all over with a hard vibration. Car was inspected vaguely by dealership and I was told nothing could be found. No lights came on, no warning.*Second incident: unknown. First appeared 5-22-21. After car started, the cars idle felt shaky a little. Also the acceleration slowed down on its own to where I could not speed up and I had to pull over or I could have been hit by multiple cars. Crash safety issue and stranded! Not confirmed by dealership. Going to be inspected again on 5-24-2021. There were no warnings or lights!