aoa. iam facing missing problem in vitz 1999 model with manual gear . car is missing between 1100 rmp to 1400 rmp with and withour gearing mode both. i already change spark plugs and injector and quails. and also change airfilter sensor but no rsult. plzz help.......
Reasons can be many. you need to see good mechanic or take your car to 3S for inspection.They will charge 200~300 to inspect your car.
which engine oil & gear oil you are feeding?
Cng installed? Disconnect emulator wiring.Another Possibility of bad valves