Stumbling during exceleration

I don't know what the problem might be, but you are right about computers in general. They can trick you in replacing a bunch of parts that don't need it.

I try to look at simple cause-and-effect.
1. Ignition coil: An ignition coil consists of wires. If a wire opens or shorts, it's not going to fix itself, and it would never run smoothly, so that's probably not it.

2. The oxygen sensor only compares the richness of the fuel/air mixture, so any fuel or vacuum problem is capable of setting this code. Check this one last.

3. Erratic idle when cold: Start by checking for vacuum leaks, especially PCV hose leaks. There's a PCV hose that you can only see if you take off the upper plenum. I learned this after my 2000 Taurus (also DOHC) had erratic idle, and replaced everything from the EGR valve, throttle position sensor, and about $200 worth of other parts, and the problem was a boot-shaped rubber hose that cost $15. Good luck.