Turbo actuator arm sticking,catalyst blocked.Also woodruff key on crank wears and causes pump timing to fluctuate when accelerating,runs ok at idle.When fault occurs(limp home mode) turn ignition off and restart,if power restored for short time look at the turbo also the intake manifolds block up at high mileage.Could go on but iam boring myself and my wife has told me to goto bed.Regards Jon
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