How much of an increase will I get from fixing these problems in my car?

My car has a faulty o2 sensor, along with a needed fuel induction service and NGK iridium spark plugs l. And a new air filter. 2003 Honda Element awd 4 speed

Anonymous, how many of a percent increase will it give me in performance out of 100%?

Here's what I found online:

"You know what kind of plugs most fast tuned street cars use? Old school copper tip plugs for $1.99 each. They won't last 100,000 miles but you'll get a little more power and better mileage out of them due to being a softer metal that gives a stronger spark."

Tired of asking this yet?

About 30%

. How much of an increase will I get from fixing these problems in my car