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Dirty injector?

Watchout for fake chinese coils. There are lot's of bad fakes out there.

Thread inserts.

Check that the no 2 injector is working properly. It might be clogged.

Check clutch pedal sensors.

Fuel filter or fuel pressure?

Typical behavior for an engine with CMCV (Charge Motion Control Valve) on intake manifold. Google CMCV hesitation Mustang.

Hope these wiring diagrams can be of help.

These are all the manuals you need for this. https://cardiagn.com/ford/mustang/

Battery voltage should be measured about 24 hours after the last charge. A car battery is considered fully charged at 12.6 volts or higher. When the battery's voltage drops, even a small amount, it makes a big difference in its performance. Though not fully charged, a car battery is considered...

Testing a battery by checking voltage only, is not enough. Test it under load. Sounds like a dead battery to me too.

Sounds like Charge Motion Control Valves. Sometimes during acceleration there can be a slight delay when they open around 3000rpm. Normal for a Mustang and nothing to worry about.