What could be wrong with my 2004 chevy impala v6

What is your question?

My check engine light isn't on no oil light or anything but sometimes it seems like it dont have a lot of power. I have to step on it to back up. And I noticed today it didnt want to switch gears on the high way (the second gear ) my review mirror light turns on 5 minutes after I push the button to turn it on like it's got a short in the wires. And only sometimes when it does switch gears it jumps and I smelled a burnt smell coming from under the hood