My 1993 Pontiac Bonneville does the same thing, my dad ran some diagonstics and thinks it's the EGR valve. He's replacing it for me, and I'll let ya know if it fixes the problem.
Is the AC turned on?
I think I'd check for a loose, cracked or missing vacuum hose somewhere under the hood. FriPilot
There can be many reasons why a car surges while idling. Some of these reasons are the computer could be dying, or the fuel injector are giving the engine too much gas.
IAC (Idel Air Control Valve)
If a 2000 Pontiac Grand Am shuts off while in drive, there could be a problem with the passlock sensor. There could also be an issue with the fuel pump.
If its computer controlled engine, it more than likely a dirty or bad Idle Air Control Valve.
you left the windows down while it was raining
Its going bad.
could be a number of things first tap on your mass air flow sensor while it is idling and if it lines out change it. or it could be your IAC (intake air control)
No, because the 1996 Pontiac Grand Am came with a 1.8L rotary V8 and the Chevy Cobalt came with n/a 2.0 that tops out around 110 while the Grand Am can get up to 190mph.
The ignition switch in a 2004 Pontiac grand am can be installed by first Sliding out old lock cylinder and then Press the small release tab While turning the key to the ON Position.
Low coolant? Cooling system airbound?