car has engine light saying power reduced and go only runs 10 miles per hour

Your car's computer is in 'limp home' mode. Something drastic has happened that the computer is making the car barely driveable unitl its diagnosed and repaired. The car will not run any better until its been looked at and repaired.

thottle body sensor gm changed the fitting of thethottle body horness. to replace the horness is difficult because it is all white instead of colored coded