My 2004 307 SW Petrol model with the Tiptronic Transmission have recently started to give me problems. It starts okay and drives off ok but once I come to a stop it gives a learching motion and seems to engage 2nd gear. When it does this if I put the car in manual mode it still displays the D and not 1 so I have to put it back in Drive. When driving off it moves off very sluggish and if I press hard it jerks at times. I have changed the transmission fluid with no effect, I was told it might be the MAP sensor. Anyone has the answer?