[Theodorable]

Hello, I've come across a problem. I got the codes P062D, P1235, and P0300. Recently I changed out my spark plugs due to the fact my car unexpectedly was underpowered and my exhaust did not sound as loud. Not only did it not sound as loud my car drove and felt different. So I changed out the sparkplugs not long after, I got a check engine light and I stopped the car and pulled over. I called my uncle to help and right when I started to move my car stalled. I have an automatic version, I know it's not impossible for automatics to stall but still, it was very surprising. The RPM idling was a lot lower than what it was before I changed the spark plugs. I honestly am so lost on what to do.