I just had this happen on my '92 yesterday. I was checking the adjustment of my TPS. When I finished I started the car and the idle immediately shot way up, then it dropped down real low, finally it died. I thought I had messed up the TPS adjustment. The problem was due to a large hose that I had pulled off the throttle body to get better access to the TPS. I forgot to reconnect the hose.
Reconnecting the hose fixed the problem. Check all the hoses around your air intake, throttle body, and intake manifold. There's a bunch of them and the ECU is not happy when it gets big gulps of air, and it's not expecting it.
Good Luck
__________________
- Jim
'02 Outback - Wife's car
'96 Legacy Wagon - Son's car
'95 Legacy Sedan - #5 Daughter's car
'93 Impreza Sedan - #4 Daughter's car
'92 Claret LS-L - My car ____________
TOTAL = 595,000 Subi miles