Halhammer

Please this is a simple problem for you scooby bods,i have not had mine a year and it is my first ownership of this brilliant car.Its this i had to replace my throttle cable and since doing so i have had a few hiccups.At the momoent i have now got the car to idle at around 900 and it does this constantly without missing a beat.But when i drive it the engine coffs and judders when the boost is active,also the engine check lamp is lit at all times.Surely fitting a new cable would not mess around with the running of the car.But i am so new to these cars and only had bmws so i guess its a new ball game.My car is a 1996 import wrx. Any advice would be appreciated.