Thanks mate for such a lovely explanation. i missed it and thus the delay.
Well, luckily not a single impact@this car.
My issue is I checked other cars specially titanium model and none had this issue. Also, mechanic said Titanium got Auto AC which is not designed to cause RPM shift. Crap isnt it?
So folks after all the issues with Ford - identified the diagnostic mode. For ref see video below.
https://www.youtube.com/watch?v=WdGciMA2yxc
To my horror, in this mode - Vehicle RPM are lower, No RPM Shift are observed.
I.e In normal mode i.e when NOT in diagnostic mode - RPM are higher than what I get in diagnostic mode. Thats why laptop test never get hold of it.
No RPM Shifts when in this mode. Needle stays at same place. No vibrations.
Guys, now I get it why their laptop shows no fault. Also, seems companies cheat this way - Remember VW's emission test.
Another thing, above mode always shows temperature at 82/83'C
even after fan was running for 30+ minutes during idle. Is this not strange???