I used it on a Renault Clio mk3 1.2 tce, which seemed clogged (had some hesitation and a slight tremor at idle) and it improved.

Classic gasoline additive along with STP that you can find everywhere, helps in removing water, and "cleaning" the entire fuel system. In an old and worn-out vehicle, it did the job from the first moment, stopping some hesitations at low speeds, and increasing the idle. It's great for regular maintenance.