Ever since my mech finished working on my 2005 Toyota Highlander the acceleration is not fast again, whenever I try to overtake with speed it doesn’t move as usual. I did my exhaust still same thing, I asked him to check the plug he said it’s okay and I’m so worried. Pls help.

Check your fuel pump.

For the time been when you want to accelerate don't put heavy pressure on the pedal once just put your feet and be increasing the pressure gradually and steadily and please do not overtake ("sharp bend" or not) because loss of pressure from accelerating can lead to accident.

Abi your mech don tiff your catalyst put nonsense there

Check your wheel balancing and car alignment is fine.

If alignment is bad, car won't move fast

Next be sure your traction and abs is not faulty.

You should be fine after this.