Hi I have a MK 5 GT 140 , which runs fine on a short or quick trip to the shops. But if you go on a long run, then thats a different matter. You come behind a slower car , drop it down a gear and start to accelerate past ,as the revs increase the engine appears to hesitate ( only when hot). So far the garage has put injector cleaner in,a new tandem pump, and lately replaced the erg valve and the inlet seals (all under warranty thank god). But the problem persists.Anyone got any ideas? Be much appreciated.