Assalam-O-Alaikum Brothers
Today i went to mechanic for cleaning fuel tank and to start car on petrol, he cleaned the tank, instaaled new fuel pump and car started on petrol but few more issues arises after this.
Before this on CNG my IDLE RPM was 0.4k and when i turned on the AC RPM automatically goes to 0.9k.
When i start the engine and pressed the accelerator water dropped from silencer.
Car was very sommoth on cng and very good pick on cng, some times i feel like im driving it on petrol.
fuel consumption was normal, and when i remove my foot from race pedal on 2-3rd gear on 20-40kph car was smooth and no jerk (dnt know exactly jerk means jhatky)
Now the following problems are
on CNG my Idle RPM is gone to 0.7k and when i turn on the ac it drops to 0.3k and some time engine shut.
no more water from silencer.
pick is bad, and when i press the accellator gari ghut rahi hai.
AC on kar k chalana azabad hoo gaya hai jab tak mn 1.8krpm tak pull na karo gari nahi chal rahi or jhatka mar k band. pehly to bgair race diye ac on par 2nd gear py bhi uth rahi thy easily.
fuel consumption is very bad.
on petrol idle race is not going to below 0.9k and engine race is not smooth its like halki c race up down up down aesa hoo raha hai.
on petrol pic is bad i think a thousand cc alto have more pick on petrol then my 1500 cc civic.
Mechanic told me that my carb is in bad shape and it was working fine on cng but we added petrol so it will create problem, he suggest me to replace it from sher shah or repair the carb.
he also told me that k jab ap ac on karty ho jo race auto increase hoti thy woh carb ka fault hai.
now brothers please guide me what to do. Mechanic is trustworthy and he is very sincere.
All type of suggestions are welcome 
