I like to thank everyone for their very kind feedback to my problem.
I just notice that my idle speed is sitting under 1000rpm just now! Used to be around 1300rpm yesterday until I replaced another idle control actuator again(valve).
This time, the idle speed will suddenly rush up to 1500rpm when I shift from D to N and then settle back under 1000rpm after about 5 seconds.
This always happen between shifting only.
Could this be due to some other new problem now?
Will this sudden surge of power between shifting damaged my transmission?
Thank you all once again!