A lack of power is a classic bad fuel injector symptom. The injectors are probably not bad, but just plugged to some extent. This leads to the engine running very lean because the fuel is not getting into the system. The computer [“ECU”] that controls the injection might not read the lack of fuel getting into the engine, which means no correction will be made to the fuel input. This will result in a lack of fuel in the ignition chamber and a lack of pressure to push the piston down and turn the crankshaft.
Stalling and misfiring are also classic signs of bad fuel injectors. The fuel injection system is like a precision drum performance. When the drummers are all synchronized, the sound is amazing. If they get out of synchronization, it just causes headaches. The same is true for your engine. A lack of fuel will choke off an engine just as a lack of food is going to cause you and me problems.
Your car will not start. Is this a bad fuel injector symptom? It can be, but it is unlikely. You would have noticed all kinds of symptoms before this step including stalling, inability to idle and so on. The chances of all your injectors going bad at once are remote, but some cars may shut down if one or more plug completely to keep your engine from being damaged. Regardless, you need to get to a mechanic asap!