P1416 has to do with the MDS (multiple displacement system) not working for cyl 6 which could also cause the P0306 code. The other misfire code migth not come back if the cyl 6 problem is fixed. Possible causes are- Solenoid/ solenoid shorted to ground or circuit open, low oil pressure at the lock pins, restricted oil passage, lifter, PCM. This might be a little beyond DIY, should probably a have a reputable shop look at it
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Monday, February 18th, 2008 AT 7:41 AM