If you have a Coupe, the ECU is located on the passenger foot well. You'll need to pull back the carpet, then you'll need to remove the cover to access the ECU.
If you have a Sedan, its under the passenger seat. Place the key in the ON position (engine not running), then you should be able to see a red light blinking. Count the blinks and let us know what the code is.
If there isn't any code, where is the RPM needle staying at when neutral? Does it feel like the gas pedal is sticking?
17" DRAG DR-11 Rims/\Matador Red Paint/\Custom CAI/\LED Bright White Dash Lights/\Kenwood KDC-X590 Excelon Mp3 Deck/\Ford Taurus Coin/Cup Holder/\2 12" Kickers/\1800 Watt Kenwood Mono Amp/\Power Acoustic Capacitor/\Clear Rear Turn Signal/\Reverse Glow Gauges/\Swapped 88' Headlights to 89'-90'/\Swapped 88' seats to 89'/\JDM Rear Chrome Trim/\JDM Clear Corner/\JDM Power Folding-Heated Mirrors/\Stromung Muffler