If you’re using the Asobo A320, you need to redo your sensitivity curve. Namely the neutral point to set the sim where the actual IDLE point is in relative to your physical throttle position. Same thing goes for the other aircrafts.
Otherwise, if you’re on A32NX Custom version, you should be able to repopulate the Throttleconfig.ini file with the previous values that you already had before. And the should be back to normal. As long as your sensitivity curve is fully linear at 0,0,0,0,100