have a 1983 celica supra wont stay on??
 

have a problem with my supra wont stay on i chaged the efi sensor replaced the fuel pump n filter so now all i get is a quick start and then it cuts off could it be the fuel pump doesnt have enough pressure???

sounds like your air flow meter.
pop off your air filter and push in the flapper inside your AFM with key in ON position. you should here the pump turn on. otherwise test it with a multi meter and ensure its plugged in.
also test your fuel pump relay, and check for codes.