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My car has started rough idling when at a stop. A couple of times the engine has stalled while at a stand still, seems to be worse when the AC is running. Could this possibly be a clogged or broken fuel filter?

Hi Skip what sort of vehicle is it, have you had any issues with the vehicle leading up to the poor idling such as a flat battery?

It's a 2001 Toyota Opa, no battery is fine. It's had a new drive belt fitted recently as well, last service was in February (silver service)

Any suggestions please?