Sounds like something simple with the Mass Air flow Sensor or a problem with the signal from the cam or distributor
1. Check your Mass Air Flow Sensor.. Make sure its still clamped on tightly
2. Check outputs from the Mass Air Flow Sensor KS(GTE), VS(GE), THA(GTE+GE)
3. Check outputs from cam sensor or distributor
OR
Short TE1 and E1 to read the codes, there should be one.
This will tell you how to read and interpret the codes
Around page 30
http://www.turboninjas.com/mk3supra/...-EFISystem.pdf