No, if it was an injector the computer would not trip a check engine light. The backfire you hear is not coming from the cats, it's coming from the engine, it just sounds like a hollow "bunk" sound as the cats muffel the backfire.
For some reason you are not getting enough fuel. Check your TPS voltage and see what it's coming up with, see if it's giving you full throttle, and pull the plugs to check what they look like. Are they carboned up or wet? Are they white and ashey? Double check your MAF is connected properly, especially if you disconnected it when you were working on that side of the engine to get at the hoses.
Popping on both sides indicates to me a less likely fuel injector scenerio, but a more likely fuel pump problem, MAF problem or TPS problem.
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