Vauxhall Insignia knocking noise

2010 Vauxhall Insignia Problem

CarVauxhall Insignia 20 ctdi sri
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When i am crawling along in traffic in 1st or 2nd gear every time i accelerate and then release the accelerater pedal i hear a single knock sound which seems to be coming from underneath the car somewhere? Any ideas anyone.
Problem Category
Gearbox & Clutch

Steering, Suspension, Brakes, Wheels & Tyres

Running Rough, Starting & Power Loss

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