Megane problem 1 phase two 1.9 dci

Hello, I have a problem with my megane 2005 privilege DCI 1.9. The problem is that it lights a light on the board, the preheating light of the Disel engine. And the car makes it very slow, too much. You have to step on it thoroughly to lift some speed and when the light raises the light goes out. Another thing is that when you leave it in neutral in progress that remains in 1500 revolutions as if I were treading (when obviously the normal thing is 1000) forgive for my ignorance, I do not know much of cars if I am wrong in something but try to explain as well as possible. I need help if anyone knows, thank you very much

Hello, did you change distribution strap? If you are not going to have to scan it many times it is out of point and the ECU protects the engine so it has no reaction greetings

They can be several reasons, I suggest you make it scan, it can be from a dirty MAP to lack of high fuel pressure, covered filters etc.