That's some thing new for me, I will try to change the oil but if that is due to oil it must be at all RPM and even at idle.
But issue was only at some specific RPM's and now issue is much subsided as I was feeling clear jerks at those specific RPM's but now I only felt car is not comfortable at these RPM's.
What I changed last was plugs to the factory specific ones but were from after market not from Toyota. But I remember after changing plugs issue remained there.
But after that I parked my car for 2 days and then drove it from lahore to Pindi and driving it daily from rwp to islo for office but feeling that my car is trying to say something on those RPM's
Lakin there are no clear missing signs that were in the form of jhatka's at 1.2 to 2 RPM during driving only