Hyundai Repair: accent 2001 lean fuel, throttle position sensor, oxygen sensor

Question
car immediately fires when started then looses power .  I have to restart it 3 0r 4 times.  There is also a loss of power.  Various codes come up throttle position sensor, miss firing, oxygen sensor, lean fuel on rail.  I replaced fuel filter, oxygen sensor, and know that the injector only spays out of one when starting.  

Answer
Hi, Grahasm.  I doubt this will be a simple problem to diagnose.  

To help me figure out what's going on, I'd like to know what the actual trouble codes are.  This will tell me significantly more than a list of suspect components.  Also, when you say the car loses power, do mean it runs poorly or just stalls back out?  When/under what circumstances does your loss of power occur?  Does the car run normally after it's started several times?  How did you determine only one injector is spraying?