Hi, I am a relatively new owner to a 2011 9-3 and I've notice a slight stutter when the car is under load or when I hit the gas hard like when going on on ramps to highways. I have no engine codes and recently replaced the spark plugs for a previous cel for a cyl 4 misfire. I need to know if I can use any type of oem replacement coils for my Saab or if I have to go with genuine ones. Also will the offbrand ones work and just cause a cel, or will they cause more misfires/problems. I know someone who can remove a code from the system completely.