HELP! Saab 9-3 2002 breaking down. So my check engine light goes on and off from time to time. A mechanic was finally able to catch a code for combustion coils. However since then the light has gone off. Car has been running beautifully. 3 months later and the light has come back on. Now I am stalling at every stop. I am lost at what to do. Bring to a mechanic and who? Fix or sell? Is it time to let go? Please any help is needed.