Chain fell off now there's too much resistance in pedals
I converted an old Trek bike to an ebike with the Tongsheng kit last year. I just took it out after it sat for the winter. The first ride was fine. Today, the chain fell off the front ring. When I put it back on I noticed the pedals now had a lot more resistance. With no electric assist I could do a half rotation and it just sort of would stop not allowing a smooth pedal motion. On my way home the bike just decided not to allow any more forward pedaling. I had to walk the bike home, fortunately it was only a few more blocks.
As an aside, last year I remember on one of my last rides, one of the pedals slowly came loose while riding. I'm not sure if that would be related.
Does anyone have an idea what could be going on with my bike?