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brake booster
I dont know if you have a brake booster fitted , but if you have then it could be the "oneway valve" that pushes into your booster and connects to your intake manifold.
If you have a booster and this valve is faulty then when you apply the brakes the booster will drop vacuum and draw vacuum from your intake manifold, if this happens then there will be no vacuum at the carbie to draw the fuel out.
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Cruising in 5th

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