Billy, i had a similar warm idle loping. The engine was moving around like a varmint in a potato sack.
In my case, i had two problems. One was that a brand new coil pack was dying, but not completely.
The other was a brand new ac delco spark plug sourced from the local Napa Auto parts store.
The center electrode had become loose. I only noticed when i went to gap the plug the third time and noticed the gap was always whatever thickness i put in.
I then took the plug and gently shook it and only then did i notice the center section going up and down like a piston. Never seen a plug do that before. Obviously somebody dropped it before it was sold to me.
Not saying thats your problem but between the intermittently failing coil pack and the loose spark plug i had the exact same symptoms.
thankfully i kept the original coil packs when i replaced them chasing a different problem, so i was able to put them back one by one until i isolated the bad coil. Of course two weeks later a second new coil pack failed and thus you will always see me jump on a thread warning people away feom the ZZP branded coil packs.
OEM or NGK for the win.
also you should check your evap solenoid located on the top (easy access) of your intake manifold. You simply unplug the electrical and vacuum lines, remove one 10mm boltand then try to blow through it like a straw. If you are able to push air through, its bad.
Its a 4 minute, no cost check, to remove it from your list of possibilities.
