Weird shutting off problem

[jcs1391]

Hey guys and gals. I have a weird problem with my car (91 240sx all stock). I tried searching Google but nothing I found was having the same symptoms. The last week coming home from work I was turning from a stop sign and gave it some gas to burn tires a little bit. It squealed a little bit then it just died. When I pulled over and tried to restart it it started idled then kind of bounced up and down 100 rpm at a time till it died. When I would try to give it gas it was like the pedal wasnt even connected and didnt make any difference. Maf was still connected battery terminals were tight. Got back in and it started. It happen again this morning. The weird thing is I've had this car for almost 2 weeks and it doesn't always do this and starts runs and drives awesome. Anyone have an idea of where to start looking for the problem? I remember my buddy's coupe used to randomly shut off while driving but he said he never had the problem hard launching it sideways from a stop.