Peugeot 207 Fuel Filter Heater Issue

I had almost the exact same thing with my 207! Same symptoms. Check the fuel line and especially the fuel filter itself. Is it worse when the engine is cold?

Thanks! Yes, it's worse when the engine is cold, especially the rough idle and poor engine response. Did you fix it yourself? What was the problem?

I checked the connections, but I took it to a workshop. Faulty connection to the fuel filter heater. Given it's worse when cold, I'd recommend getting it checked out.

Thanks. Local garage confirmed it was the fuel filter heater connection. They replaced the plug and wiring, total cost was 95€. Car's running much better now!