hey there...i got the same problem with my 92 nissan pulsar ti. auto etc. from 1st-2nd it jerks when your just going slow n stuff, but i notice when i give it a boot, its a bit smoother, but its unatural to keep speeding thru 1st n 2nd, its quite annoying me ay...im selling this car, buying a EK coupe or integra or somethin along those lines, but yeah sorry i cant help the only advice i can say is, i changed the oil and it still did it, so i dont think its that, probably that belt thing needs to be adjusted what them other boys been tellin you..

anyways..good luck with it, try asking somebody at ultra tune or something, they probably got a good idea of what it might be..

peace