Does the wear of automobile throttle clearance affect the power?

What you should say is valve clearance!

Excessive valve clearance will reduce the compression ratio in the cylinder. If it is too small, it will cause insufficient air intake and unclean exhaust, so that the fuel in the combustion chamber cannot completely explode. Reduce the driving force of the cylinder to the piston. In short, too much or too little valve clearance will reduce horsepower.