This happens to me with my Peugeot 306.
First I changed the battery, paresia that had no pontencia, it was not the battery,
then the joints of the inyestors, it seems that the mexcla of gasoline is impoverished and that is why the slowdown fails, the slowdown began to work well.
Then I had to change the condesor had gas losses of the air conditioning, the air began to work.
Then the air regulator that is next to the carsary is broken and frozen.
Then the regulator or vavula of the air that is the one that makes the air cool when the temperature rises inside in the car, this valve is the one that makes the relief begin to rise and lower, it has been a lot today has passed me again and that it has happened to it, that it has been left without gas, I believe that the Peugeot are total vasura fail everywhere.