I have VITZ 1999, i have poor performance after change the spark plugs.
Old one are BOSCH four face and i have installed new one single face NGK.
Car give poor pick on heights, i have also remove CAT from front bottom and give me noise when give more race. Also i have issue with CNG that more people have while below 5/km speed brakes get harder and car not move on start with AC.
Can anybody tell me the number of original Plug?
Can you please also guide me what consumption of CNG is best, i m getting 110km for Rs400?