Thanks to Alix66 for correctly helping me to diagnose an intermittent lumpy running problem with my 9000 2.0LPT. He has told me to get the ECM checked out. I'm pretty ignorant on things mechanical (just know that I love my Saab) so forgive me for being thick but 1)What is it? 2)What does it do? 3)What is the likely cost of replacement/repair? 4)Will only a main dealer have the necessary kit?