@sadatmasood11
My family's Santro is ok on cng but on Petrol, RPM is not stable, it fluctuates between 850 to 2000 and engine stops when acceleration is Low.
One more thing i have noticed that as u mentioned me somewhere RMP at stable + RPM readings at A/C on.
On switching Santro's A/C, RPM do not change itself, we have to press accelerator manually to increase RPM(I think ideally it should increase RPM automatically whenever A/C switch is ON)
Please i need suggestion on all points by you. In the end, i request you to post pictures of your workshop & scanners so that other pakwheelers can be impressed by your tools and workshop too