Can anyone help with this fault code

[PaulMK4GTI]

Scanned the car today with a Gendan code reader, came back with these codes

04E1
04E2
04E3
04E4

after searching round on t'interweb they seem to mean this:

Fuel Injector for Cylinder 1, (N30)

Fuel Injector for Cylinder 2, (N31)

Fuel Injector for Cylinder 3, (N32)

Fuel Injector for Cylinder 4, (N33)

Open or short circuit, +12V supply circuit breaker or fuse open


Unfortunately that's still Greek to me, anyone know what i should be checking? The car's a 1.8 20V NON turbo (Engine Code AGN). It's running fine but every now and then the idle speed is a bit erratic when the engine is cold.

[Rhyso]

possibly the coil packs themselves or the wiring connecting to them - could have a break in it giving intermittent contact 

[dai-cymru]

clear the codes and see if they return