Renault Medallion Lumpy tickover, big flat spot when accelerating

2003 Renault Medallion Problem

CarRenault Medallion 1800 Dymanique petrol, manual
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Car starts fine, ticks over ok for about 30secs then goes lumpy. If you drive within the first 30 secs its perfect. After 30 secs she will not respond to acc pedal until depressed over half way then revs its nuts off. Whilst driving on motorway at 60 the first quarter movement has no response then takes off like a rocket.
Problem Category
Electrics, ECU, Warnings & Lights

Running Rough, Starting & Power Loss

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