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Thumping in exhaust

Car  Clio RS 200 Gordini
Hi, going to have lots of questions from me, good and bad; some retarded.

Anyway, on idle at the side of the road, there sounds to be a thumping here and there from the exhaust? It's not constant but it does happen regularly. Is this unspent fuel and is this normal? Just eliminating whether it needs anything done IE: Plugs, Injectors etc. Want the best for this car.

Thanks.
 
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