the sensor you are thinking of is the TPS = Throttle Position Sensor, which works together with the MAP sensor = Manifold Absolute Pressure... to check the TPS, there should be 3 wires, tpin and connect a scopemeter to the middle and top or bottom sensor and set it to check resistance, resitance should change in a constant sweep as you move the gas pedal, if there is any break in the resistance it means that there is a worn spot in sensor..... the MAP sensor could also be dirty, it will be on the intake piping, a rectangular box with i believe 6 wires on that car, take it out and clean the sensor tip with electronic cleaner, be sure to be careful the little wire in there is very fragile.... i really doubt it would be transmission related.... but also to clean those injectors better you can take them out and hold them upside down and lightly tap them on a bench, they have little screens to catch particles..... make sure to replace the o rings if you do take the injectors out.... another thing could be fuel pressure, the regulator could be going out.... to find the regulator trace down the fuel rail and fuel line to find a little device with a vaccum hookup... you can disconnect the vaccum line and plug it to give full fuel pressure all the time... its not so much pressure it will damage anything and it might even give you a little bit more pep