Hi, My 2009 Vauxhall Insignia nav 2.0 engine went so mechancic said it was flywheel so had flywheel and clutch replaced and engine was still making rattling noise so I had the engine reconditioned which was costly, but now shudders between 2000 and 3000 rpm had new egr cooler, belts, had injectors checked, but nothing seems to change the shuddering, does anyone have any idea what this could be, Basically the whole engine is new the only thing that hasn't been changed is the gearbox which we are nearly 99% its not the gearbox.
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