First off what kind of ingition do you have? If you have an electronic ingition then you may have a computer probelem. If you have an old style with a carbuerator and a timing belt then your timing might be off. In any case take it to a quilified mechanic for a diognostic test.
This question requires the year of the vehicle. You can start by visual inspecting your ignition system while the engine is running if there are cracked ignition wires it could be stricking other enigine components.
Camaros, like any other car, can start to lose spark, and lose combustion and power from faulty caps, rotors, spark plug wires, bad spark plugs or improperly gapped plugs. All of these parts are relatively inexpensive when compared to the engine damage a misfiring cylinder can do. Be sure to check you manual for the proper sizes!
Originality (short or long bed, short fetch a higher price) 2 - The part of the country you reside and where you plan to sell it. Nothing less than 2500. 00.