My scenic has an unusual tick over cycle. It starts perfectly first turn of the engine then tickover 800rpm as it gets warmer tickover gets faster. After about 5mins of driving at a convenient set of traffic lights switch off engine , switch on again the revs go to about 1500rpm then drop to about 800 when that happens I have to jab the pedal slightly and then it'll tick over at 800rpm for a while. However if the revs drop below 800 for whatever reason the engine will then tick over somewhere between 1000- 3000rpm. Before I discovered the switch on/off trick it appeared that the tickover would go in cycles 800, 1500, 2000, 3000 then back to 800. Any advice would be greatly appreciated.
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