too much cold air?

[93SVTstang]

I recently put a MAC Fenderwell cold air induction on my Cobra, but ever since then when I rev it, the filter makes a suction sound and when I pin it to the floor it doesn't tach up at all...it just bogs and makes no power. Is it possible that it is now getting too much air? Today, I covered the filter with duck tape so only some of it was open to air flow and it worked perfectly!-it actually got out of its own way. I don't want to keep driving it like this, so how do I adjust it to give it more fuel to compensate for the added air? If that is really the problem. I can't think of anything else it could be because it doesn't make sense that it wouldn't be getting enough fuel already with the 24# injectors. Any suggestions will be greatly appreciated. Thanks

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93SVTstang-93 Cobra: 73mm MAF, MAC fenderwell mount cold air, BBK underdrive pulleys, 8mm plug wires, shorty headers, off road h-pipe, Borla Cat-back, centerforce clutch, hurst shifter, 3.55s