New here and need help

[mandys13]

Hello my name is Amanda. I just picked up my first car it's pretty stock, but it is a 90 240sx with gp sport body kit, tein coilovers, magnaflow exhaust, act clutch, and 17" 5zigen fn01r rims. The problem I'm having is the car idles funny. It will dip and almost die but save itself occasionally. Most of the time I have to pop the clutch or restart it. I popped the hood to see if I could find out what was wrong because the guy who sold it to me said that the mas was bad. I looked at the mas, and coming from the same wire loom are 2 sensors or something that aren't plugged into anything. One of the plugs says SJD...I don't know what these are, or where they go, but I think that it might fix the idle problem. any input would help, thanks a lot.
I'll try to put up pictures tomoorow.