Why does my car suffer from engine run-on?

kristianm

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hi, my car suffers from an acute case of engine run on. its only very briefly, we're talking a second at most.

if i apply the brakes and turn the engine off, there is no run on!

the car is a 2.0 vectra petrol engine.

could there be a vacuum leak somewhere that is sealed when i apply the brakes?
 
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