A major vaccum leak.
1st gear is fine but do not overrev the engine
it can cause the car not to start.
hold the throttle to the floor and while doing so, turn engine over and let engine rev up (do NOT overrev) before taking your foot off the throttle. When it first starts, it will run very rough and blow black smoke out of the exhaust as it burns the excess gasoline in the cylinders.
It is possible but not likely.
Maybe a throttle positioning sensor? Is it hard to start? Does it start then stall?
It would start and run but only idle. It would not be drivable.
Try the brake lamp fuse
vacuum leak? carburetor adjustment?
To kick start a motorcycle, first make sure the motorcycle is in neutral. Then turn on the key and turn the throttle while putting the foot down hard on the kick start lever. Also make sure that the clutch is also depressed. Some motorcycles will not start unless the clutch is engaged.
your throttle body could be sticking i'd start by cleaning that
adjust your idle screw at your throttle body and check your cold idle stage stitch at the end of your accelerator cable at your throttle body. it may also need adjusting
He couldn't start the engine because the throttle was stuck.