I've noticed that when my GT4 is cold, I get a bit of a 'shudder' when I am accelerating. Doesn't seem to be a 'miss' but instead just sort of shudders as I'm accelerating (hard to explain).
When it has warmed up, it doesn't do it. Only seems to be an issue when it's cold.
Any ideas? Is it fairly normal or could it be a symptom of my leaking turbo manifold? Or is it likely to be dodgy fuel?