full power tuning AT 3rd gear

I have a question regarding the full power acceleration if i have Automatic transmission and i selected the 3rd/4th gear and i press the acceleration pedal to its max full throttle ( kick down) it will shift back again to 2nd gear in this case what is the right solution to prevent from shifting down automatically ?

I can't give specific advice.

However, it would help a lot if you stated the vehicle, the engine, and especially the transmission, as different methods are used to impliment the 'kick down'.

I don't think they've been used for years, but the simplest are a simple switch under the throttle pedal or a cable connected to the throttle linkage. If either of these are used you should be able to simply disconnect them.