Slight vibration and knocking.?

Question:
I have Accord 2002 model (Automatic). Whats its idle rpm should be? i feel its less. It shows me around 750. I feel slight vibration in car when i put in Drive from Neutral without leaving the brake. When i leave brake vibration reduces little bit and when i accelarate then no vibiration.

How do you disengage the caliper when changing the brakes and rotors on a 94 Ford Explorer?

Secondly i get strange knocking sound like when we bolt the door (at lot lower volume) or when we hit some small aluminum piece over big piece. I get this noise when i shift in Reverse from Neutral and it comes back when i go Neutral to Reverse too. It doesnt come in any other D gear options. Its very fast and very little noise i get everytime i shift to Reverse.

Does weather/temperature affect pinging/knocking?

Can anyone please answer these two questions. Thanks in advance and Wish you very Happy New Year. Have Fun. Cheers.

Answers:

What is the problem with the brakes?

750 is a good idle speed. the noise sounds like an enaust pipe rubbing[hitting] something...its very common.when you change gears the motor twists one way than the other...

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