Check all the fuses in your box to see if any of them blew. If not I would start by getting a volt meter and checking the voltage your battery is delivering. Once you know its 12v or above, then you can start looking at other things like the maf voltage. You can usually tell when the battery is getting less juice when you start the car. If so replace your alternator because its not recharging the battery when you drive the car. The only thing I can think of that would cause your car to run rich and sputter is 1) Bad Maf 2) Bad ECU. From my Power FC my MAF voltage is roughly 5v when it is revved up. My battery reads 12.8v. Sorry I cant be of more help. If it makes you feel better I did the same thing on my RX7 and I had to replace the alternator and battery.
-scott
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