Engine Flush:
1) Buy engine flush (only liquimoly )
2) By new engine oil and filter
3) Go to workshop for oil change
4) Add engine oil flush to old oil and run the engine for about 15 minutes at idle.
5) Drain old oil
6) Replace oil filter and add new oil ( 5W30). Fully synthetic SN Grade. I prefer Total.
Fuel injector cleaning: For this go to Toyota 3S ask them to do this for you. The injectors shall be removed from you car and ultrasonic cleaning will be done by machine. Once completed, ask for report and then these shall be installed back.
Note: You can buy engine flush from Pakwheels online shopping.