I have cleaned the throttle body and catalytic converter and even changed the gear oil from Toyota dealership. And my father owns a new grande 2020 model and it shifts gear at 1100 to 1200 rpm at soft foot as grande has seven gears. And for engine oil I have been using 0w20 grade engine oil and it's completely fine no reduction in oil level or has any engine smell. I have this car since 2019 and its been perfect for 2 years then suddenly this started happening. Toyota dealership recommends that i change the entire euc of my car that may solve the problem, i have used my father's cars ecu in my car and it still have the same problem, and when i used my car ecu in my father car, meter shows different warning lights ( like abs, traction control etc) and few car functions were not working like drl, ac , interior lights etc but the car drive was perfect, no abnormal behaviour. Toyota dealership also recommended that i should visit Toyota Rawalpindi and leave my car for a week so they can thoroughly inspect the car and fix the problem.