yea i was going to say filter, but since you changed that already........
i dont think its injectors. The car should still run if one is bad. And i doubt they all just went bad at once. If an injector was out you would just notice a real sluggish power band. ANd at stops your car would do the "V8 shake" as i like to call it. The whole car just shakes like you got some huge power in there lol.