2009 Dodge 1500 5.7 Hemi misfire

My truck has 222,127 miles. Been running strong.  
Very consistent on my oil changes.  The engine has
never been cracked (worked on internally). I
recently got and engine light.  IT “bings” every once
in a while. When it does it shimmy and shakes and I
loose a little power. Then it like, comes back on line
and runs smooth.  Just changed all the spark plugs
as an attempt to use process of elimination. What
would be next on my way to recovery.