Yes, the p0741 code and many other codes can sometimes be fixed when you flush the transmission.
Your transmission doesn't have an 02 sensor. The o2 sensor monitors engine exhaust to control engine performance. But, dirty transmission fluid is a problem and should be changed before it cause a major and very expensive transmission failure.
Many things can cause a car to be sluggish like dirty air filter, check engine light came on, bad transmission, bad engine, etc.
Low or dirty transmission fluid Transmission bands are worn
The most likely cause is a dirty fuel filter that starves the engine.
dirty tranny fluid
If it is restricting the flow of fuel, it can cause low power.
check transmission fluid for correct amount or being dirty if fluid is ok your transmission is wearing out
I have metal in the transmission pan and the filter is dirty
Could be, (assuming the starter is not cranking the engine) a bad starter, dirty or loose battery connections, the engine is seized.
No, it would not. There are many things that could cause a stall at idle. The throttle plate could be dirty as well as the mass air flow sensor. You did not mention the kind of car or engine size. Is the check engine light on, is it when the engine is warmed up or cold?
Engine speed sensor faulty. Dead battery or batteries. Loose or dirty battery connection. Dead spot on starter.
Yes, it is possible.