Misfire at Idle and WOT above 4K RPM
 

I've searched and believe this to be a coil pack, but before ordering parts I thought I'd throw this out to see if I'm on the right track.

Last week, my car started stumbling/missing at idle. The stumble goes away the second you touch the accelerator and you cannot notice it at all when driving. It is very cold here, so I assumed an idle air valve issue. BUT last night, and today, I noticed that at wide open throttle I would also get a stumble/miss at higher RPM. I only did this twice, so as not to grenade a piston.

There are NO CODES, no CEL, no drive-ability issues, by the way. The fuel filter is less than 2,000 miles old and the plugs are about 15,000 miles old.

Any thoughts?

ignition module, accelerator pedal, but they'd throw a code. so would coil packs.

most of the time when you have a bad misfire a CEL will be generated.

if you are getting a vibration start checking your engine and transmission mounts

Just checked again, no codes at all.
The mounts are new (as are the flex joints)... besides that isn't it.
It is a definite misfire but smooth as a baby from 1000-5000 RPM.
It must be ignition related.

my guess is ignition module. i had to have mine replaced and it didn't throw a code.