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I would go with swithcing out the spark plug wire of a good cylinder and seeing if it switches to that one, might be the wires, if not when was the last time you changed the fuel filter, most often lack of power like this is caused from a clogged fuel filter that is going to eventually lead to a bad fuel pump. As DEI37 said its either ignition related, or fuel related. I would suggest the plug wires first and test it to see if the problem travels, if it does its the wires, if it stays, check the cap, rotor, distributor coil, and any other ignition sources you may have, having a diagnostics computer hooked up to it to tell you codes of what is wrong is also a big help. If you went through all the ignition, from the battery, all the way down through the spark plugs and EVERYTHING in between, then go to the fuel, start with fuel filter(s) depending on how many you have, some cars have 3 or more, most have at least 2 nowadays. After you make sure you have your fuel and ignition working good, then start to think about more serious engine problems. But one thing you should do as well before going to more serious problems is replace the o2 sensor(s) and other sensors, MAP, Knock, ect. This is if your doing it yourself, if you take it to a mechanic to do it (probably are if you went to autozone to ask for help) then they'll go through all that for you, and btw, I'm not positive on this, but pretty sure that the engine is a L4 not a V4.
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-snooch to the nooch
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