Q: Ongoing engine/exhaust problem Volkswagon Polo

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Hi my VW polo is having engine/exhaust issues which I cannot solve. The management light flashes when idling and the engine starts shaking violently which causes the car to lose all power at times when driving. A mechanic diagnosed the problem as faulty coil packs and spark plugs all of which have been replaced yet this is still happening :( what could be wrong? Thanks, Dan

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