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Hi,

My car is shaking during a stop or idle. What I actually did before it happen is that I removed the negative terminal of the battery when I installed my reverse camera and when I return the connection back and and started to turn on the engine I notice that there is a severe shaking during idle.

Hi there,
What the batter disconnection has done is cleared the idle system memory and now it's returned to factory "new car" setting.
You may need to have the idle system cleaned and reset- alternatively it will eventually relearn.