can anyone help i have got a 96 impreza sport recently changed engine
wont keep running dont think its immobiliser as light goes out when ignition comes on have replaced coil leads plugs air mass sensor and have run out of ideas if i rev it up it will keep running but wont tick over for more than 5 seconds please help

 

Idle control valve maybe, have you read the fault codes on the ecu??

 

there isnt anything on the self diagnose