When riding the pedals feel very weird making it difficult to ride.

The chain on the bicycle continues to get stuck and come off randomly when riding.

When riding my bike and applying my brakes it provides little stopping power for me.

When I leave my bike alone for more than a week the tires keep going flat. I check for puncture holes and there is none,...

One cause to having an unnatural feel when pedaling could be that the pedal is stripped. If the pedal is stripped replace it immediately as it can cause permanent damage to the bike. If that is not the problem, it could be the crank arm. The crank arm of the bike controls the pedals if there is a problem as possible solution would be to replace it.

There are many causes to a bike chain coming off. First, check to see if anything is in the track of the chain. Secondly, check to see if the chain is rusted or needs to be lubricated. Lastly, the length of the chain can cause the chain to pop off if it is too long or short.