not running right
 

my impreza engine does seem to like taking throttle!
its a 97/98 car version3
it seems to idle fine, will rev up a bit but its like somethings cutting the ignition! if you bring the revs up slowly it'll rev fine, it won't really power the car!
the engine is standard uk spec,, but has a import ecu fitted to remove immobisler
anyone got any ideas?