Zero_

hey i hope someone can help me i got a s13 shell and put in what i believe is a sr20de out of a 1991 s13 but as they are all mostly the same that's not my point. i have the engine in the car and i have the engine start then rev out and turn off, i have a feeling i'm missing something and in saying that there is a plug beside the TPS that is not plugged in and i just want to know what it is meant to go to (the TPS plug is a 6 pin and the plug that i want to know about is the 3 pin beside it) any and all help will be very much appreciated as i get to work on this car like once a week and i am in desperate need to get it on the road if anyone wants picks just ask i'm happy to upload them