Cant be a fuel pressure problem as it would affect ALL cylinders.

Unless your ecu injector 1 driver transistor is dead or dying.

As another test, (for the above)

swap injector plugs over on cylinders 1 and 2 they should just reach.

The car will NOT be damaged by this, but dont drive it hard for more than
a few seconds in case another fault is hiding a bigger problem.
ALso, there maybe a bit of throttle hesitation while doing this at low rpm.

If the fault moves then I would say you have an ecu problem or as I suggested
above a crank/phase sensor issue.