I got wagonR japanease model 2015 ene charge import 2018. At start up and idle rpm is all fine. However rpm changes by +_ 300 rpm during drive. Causing changes in rpm along with mild jerks in movement of car. I did following things
1. CAT converter change (on automatic machinr)
2. Origional spark plugs newly installed
3. Coils changed
4. Fuel filter thoroughky cleaned
5. Throttole body fully cleaned up
6. Gear oil changed
7. No actice fault code shown on scanner
Engine pick and acceleration is absolutely fine with mileage app 20 km/l
No problem with Gear as per mehanics because gear shifting and acceleration is smooth
Need expert opnion plz
