Hi Everyone, 1st timer here. Question(s): I bought a Carsoft scanner MBII to diagnose why my check engine light is on. DTC Codes are P0307, P0308 and P0309. They are defined as Misfires in cylinders 7, 8 and 9. But it looks like the reasons for the codes run from the simple to the complex. Can anyone give me some idea what a possible solution might be? I've cleared the codes, but they come right back on after a few miles. Car seems to run ok though. Thanks!