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Khufu, i dont understand how a breather pipe will become blocked only after the car runs for +70km's so i going to rules this out!
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Could it be the intake hose collapsing?? After a few miles, the rubber gets good and warm (i.e. soft) then when you step on it, the engine tries to get all that air, sucking the intake hose in on itself /ubbthreads/images/graemlins/confused.gif Then when it cools down, it stiffens up enough to hold??
Just an idea /ubbthreads/images/graemlins/crazy.gif
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