i have swaped my engine from 1000 cc to 1300cc and after swap i am facing prb that my car is unable to run on patrol,i have changed carborator and fuel pump but still the prb is thr.car is running perfectly on cng,but when i switched from cng to petrol some time it run 5km,then it switched off and unable to start gain,some times it refuses to start at conversion from cng to petrol,i am confused what to do,