Peugeot 406 Unstable rev, not idling, whirring

1999 Peugeot 406 Problem

CarPeugeot 406 1.8 MT petrol 16V UK
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The car is exploding on starting and produces a whirring sound. It slowly switches off on idling. Sometimes it switches off on releasing accelerator eg stopping at a robot. The whirring sound eventually dissapears in 10 mins. When in motion it jerks with a clicking sound and revs high. Sometimes it just revs without stepping on accelerator. U sometimes step on the eccelerator and it does nt respond, it may switch off or ma delay esp just after starting. Changed pump, filters, cleaned throttle, changed stepper motor. What cld it be?
Problem Category
Engine, Cooling System & Drivetrain

Running Rough, Starting & Power Loss

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