Fluctuating Idle

[quote:82ed3d7b40="chokispoke"]I just bought a used 01 Honda Civic LX with 62k miles on it. (1.7L automatic trans)
Everyday I seem to notice a different noise but overall the driving seems okay.

First off: 4 days ago I could hear the engine slightly revving at idle. It hasn't happened since BUT every time I stop it idles anywhere from 1000rpm to 500rpm steadily. Is it normal for it to be 700 on one stop then 5 minutes later be 500rpm at another stop??

For this: could be the IACV or an Idle speed device that needs cleaning.

Also, I can feel a lot of vibration in the body of the car 80% of the time, even in the brake pedal! Is this motor mounts?? Or maybe some sort of idle adjustment like my older volvo had?

For this: check the above item


Next: Every morning when I start the car and turn on the A/C there is a weird almost growling noise for 2 minutes. The air also isn't cool after acceleration. It runs okay besides those 2 things. Is it the compressor maybe? The belt looks like it had been replaced.

Could be the AC belt

Also: the brakes. I know they need new pads and shoes but I may need new rotors... When I am stopping sometimes it jumps down, like it's going to hit the floor all the sudden and acts like I slammed on the brakes. And when I'm at a light it will drop too. Like air being let out. Slowing down isn't smooth at all but there's no noise (squeaking or grinding), just vibration in the pedal.

For this: could be a caliper or rotor problem.

Thanks so much![/quote:82ed3d7b40]