Do you have a check engine code? Have you had it tuned? Sounds like the idle is off, but need more information.
Sounds like a fan or fan shroud problem, but you could also be dealing with a plugged radiator, undersize radiator, or thermostat problem.
its a 2002 camaro
sounds like your ignition module
Lifters or valves.
when it wont start or when something sounds funny
same thing happened to my 95 camaro 3.4l it sounds like your coolant sensor
sounds more like ignition problem. plugs, wires or distributor maybe.
Borla
Sounds like a choke problem/fast idle speed adjustment.
When there is a problem with the vent system it dfaults to the defrost setting. Sounds like you have a problem in the doors that direct the air flow.
It sounds like a transmission problem rather than an engine problem.
It sounds like no spark on your plugs check the power going to your coil if you have that then it could be the ignition module under the rotor,assuming you do have gas in it :)