Yaar, actually when I drive RPM was dropping in gears, today I have checked the grounding from the Battery to Engine that was full of carbon, than my electrician has scratch all the carbon from the wire and where it placed, because of it the engine, sensors and relevant components were not working properly, but after that noticeable change.
I would suggest all of you to check and clear the carbon from the grounding wire coming from the battery point.
Cheers;)