2000 Grand Am rough idle

Will it rev up in park or neutral ?

idle air
tps

tune up ,fuel filter,air filter,could be coils.

choke pull out on carb

Idle air control valve would be my next bet , the TPS usually just makes it rough on acceleration. Is it rough on acceleration(loss of power) ?

Then you might want to idle the low idle speed up a half a turm to see if that sovles the problem.

You are going to need to do some testing to find this...first thing I'd look at is to check for any intake or vacuum line leaks, then check map sensor and tps. I can only offer a good guess, as I too would need to do testing before offering anything better. You can get test info in most inexpensive manuals.

If it does not do it in park or neutral, it could be a number of things. One being a sticking Torque Converter Clutch solenoid (TCC). It could be that it needs a simple tune-up. How often does this problem happen?

check for vacuum leak. Has someone changed the pcv? If so they may have left off the o-ring seal off the bottom of it.

What size engine 2.4 or 3.4 L ? Dirty throttle plate , fuel injector's need cleaning , EGR valve sticking open a little , intake manifold leaking , IAC - idle air control valve passage carboned up .
Idle Air Control Valve
007 Idle Speed Problems Scan Data for Idle