hi, i have an astra 1998 1.7td estate with a GM diesel engine and its perfect when engine is cold acceleration is spot on, however when its warm or after a stint on the motorway it feels very sluggish almost as if the turbo isnt working i dont have any warning lights on at all and its rather a puzzle after checking everything making sure nothing is loose etc can anyone help me or offer me some words of wisdom on this thanks in advance
