The first thing I did when I got my stang was replace the O2 sensors, The car wouldn't pass smog and ran a little ruff. The new sensors helped a bit. Turns out my new EGR position sensor helped even more I passed smog, got a whole lot better gas milage, and the car runs great!
Anywho, my point, you asked if your car would run like s**t with out them (O2's) so I assume that it is. Put the O2 senors in (under a 100 bucks) and if it is still running bad change that EGR sensor ($45 at the dealership).
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