vadzter

hey guys, my 89 RS is playing up on me for once :-/ when you flick the ignition all the dash lights come on as normal but when I turn the engine over the car starts perfectly but the lights still stay on. ignition car on and fully running boost issues - as you drive along normally and not boosting car is perfectly fine. as i start to boost around 2.5k rpm it gets a tad jerky but then hits boost nicely but once you reach higher rpms the boost dies completely and feels like super VOD and doesnt pull and sometimes starts coughing. my idle is not too bad but sometimes when im warming the car down it will idle slightly higher around 1500rpm but will drop once again after a few mins. normal idle is around 1000rpm. how do i check that my icv is set correctly? anyone know where these ecus are from? am i running the right ecu? any help would be much appreciated cheers P.S it is a JDM legacy