How about Citroen C2 idle jitter?

High-end luxury cars and new cars are facing jitter. High-end cars have high compression ratio and high fuel requirements. Household fuel is very characteristic. The technology of engine manufacturers is based on the mainstream fuel value, and there is no research on ethanol fuel.

It's not really the engine. Just wash it once with detergent. In this case, don't worry. Add 1 or 2 fuel additives according to the size of the fuel tank, and just shake before running one or two tanks of oil in D gear.