SOURCE: Check engine light is on in 2004 Lincoln aviator
Go to Wal-Mart or Auotparts store and buy SEAFOAM. This will clean & clear the crud off of your O2-sensor. This should strighten your problem.
SOURCE: 2003 Lincoln Navigator stumbles/bucking under mild acceleration
I have a 2003 Nav with the exact same problem. I've found it diminishes when taken out of overdrive. Also it's intermittent but more towards bucking. Sorry to post this under solutions.
SOURCE: Rough idle after initial startup.
1995 Lincoln Towncar Idle rough now check engine light on?
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A flashing light means a misfire that can destroy the catalytic converter .
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