code po353

My cousin has a 2006 freestar with a 4.2 engine.developed a miss replaced plugs and wires replaced coil pack.still has small miss at idle and up to 3000 rpms.once it passes 3000 rpms becomes terrible never heard a vehicle sound like this.hard to describe bad surge popping sound.coded po 353 something about coil pack c.dont understand this code.if someone has some advice please help.

Thanks charles

internet says its probably Defective Coil or Defective Powertrain Control Module (PCM)
since you replaced the coil and plug that leaves the module

my soninlaw said something was making it hit the rev limiter at 3000 rpms.sounds possible to me the way it sounded.is this possible and what would cause this problem?
thanks for the reply charles