I should think your metering unit is fine tbh mate, if the empr (or what ever its called)... the black box with a 2pin connector on the side of the fuel distributor is unplugged or has no signal etcetc, the metering unit will go to its 'base' mechanical 'map' (not strictly true but good for explaining), this base map is set up for a warm engine not on boost.

Ie if there is an issue with that part your car will not fuel correctly on boost and normally be a pain to start from cold.

There are numerous tests you can do to test this and all other sensors.

Rob,