salam.friends. i would like to share a problem .the engine is 1nz-fe , the problem is i used liqui moly full system cleaner some time ago. i poured it in tank , car also runs in cng. after a month or so its giving problem in acceleration, the engine starts well but after it starts to vibrate and doesnt accelerate but pressing the pedal at full the engine takes some time and accelerate suddenly and on high rpm the car is fine.but after running it for sometime on petrol it gets ok... on cng its runs fine....but after a wash at service station it does the same in petrol and cng as well..and its plugs are iridium, seems like need to change them as well... havent changed the plugs ,its being 3 years now....
question is ....1. is it because of the plugs ??
2. fuel pump?
3. injectors ? as i use the car in cng so the use of liqui moly full system treatment, dirt might clogged some area.
4. petrol pump should i change it. i use PSO?
is there any way to check the fuel pump????
suggestion are welcomed as i dont want the hands of these mechanic ruining everything...i would rather try to fix it myself if i can thanks...