Engine violently shakes at start up
2013 Prius, my son's car, lately it violently shakes at start up. It feels like the car is surging a little. I read somewhere that it could be a synchronization between the MG1 and the gas engine? I'm afraid it will break something if we keep driving it? My son said it seems worse when the humidity is high out. Last night when I got a video of what it's doing, I noticed that when it's shaking, the car surges a little. Like it's in gear and trying to go, with the brakes on. Once it settles down and the engine smooths out, I did notice the car settle back a little. It's hard to see that in the video though. Has anyone heard of this problem and a fix? I get codes for misfire on 1, 2 and 3. When it was milder shaking, it only showed 1. When it's violent, it shows 1, 2 and 3. And random misfire. The way it surges, like it's in gear and trying to go, makes me think it is something in the synchronization. I'm new to this type of car. Give me an old vehicle without a bunch of electronics, and I would have it fixed already. LOL
Well, it seems I can't upload a video, just pictures. I will have to upload it to yt and post a link.