I still have the duratec MAF and its still conected but the actual sensor part of the MAF is gone. I would think the car would go into limp mode yes. I got bigger injectors and adjusted the fuel pressure. I need a new MAF and I am wondering if the previous one was bad or it might just be time to dyno the thing and tune it that way.

ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap