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What are some issues that could cause a code p306?
  • Faulty spark plug 6
  • Clogged or faulty fuel injector 6
  • Faulty ignition coil 6
  • Fuel injector 6 harness is open or shorted
  • Fuel injector 6 circuit poor electrical connection
  • Ignition coil 6 harness is open or shorted
  • Ignition coil 6 circuit poor electrical connection
  • Insufficient cylinder 6 compression
  • Incorrect fuel pressure
  • Intake air leak (check for cracks)
I'd also make sure the Air filter is clean and clean the (MAF) mass airflow sensor with CRC Electronic Cleaner or MAF Cleaner. Simply remove the sensor and give it a few short bursts directly into the electrodes. Then let dry thoroughly before re-installing.
 
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