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Car randomly intermittently jerks while driving, also feels like it drags a bit. Engine management light comes on. Had warning scanned and it came up as a problem with coil pack. However they are new and tested fine. Also recently had all spark plugs replaced and a few weeks ago had a new ecu fitted due to misfiring. Took it to garage but they said they can't do anything till problem is more persistent. Any advice would be appreciated. Fiat punto m3.

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