2006 Ford Taurus Stalling at speed and re-starting in N

This car stalls while driving along for no reason, I shift to N and restart, back to D and continue on. I don't have the error codes, tho I know they exist, as the check engine light comes on and shuts off from time to time. (Not when the stall happens). Need most common causes and approximate cost to fix as it has to be approved for me.

Today I stopped at autozone and had them pull error codes for me. The printout doesn't list the code, I think it was p0300. Here is what it says.

Cylinder misfire detected- random cylinders

the powertrain module monitors the crankshaft speed and has detected a misfire condition.

1. Ignition system fault-spark plug(s), ignition wires, coil. (I assume this means tuneup time.)

2. Vacuum leak.

3. Injector fault.

4. High or low fuel pressure. (I assume fuel pump)