don't drive it like that matey, will get you killed one day.

change...

throttle body position sensor. wiring to it
change the injector over (not hard) and its O ring
fuel pump
ecu
inlet manifold gasket/throttle body gasket

I would think its a fuel supply problem. as it intially has power, then runs out.

if you've already changed the pump/fuel regulator, then replace all the fuel hose, could be leaking/blocked/corroded

Far more likely (and cheaper) is an ignition misfire caused by knackered HT leads breaking down under load (full throttle, low revs).

Could also be a faulty MAP sensor, or even simpler it's vacuum hose is split. Check the small rubber hose that goes from the inlet manifold to the sensor under the fuse cover on the bulkhead.