Its alive but have an issue

[Dubyagee]

Got the 190D's vacuum hoses figured out, bled the injectors and ran her today. I have an issue with the injector on number four. The engine skips and when i crack the number four injector at the head a large amount of fuel comes out but makes no difference to the skipping. If I crack any of the others the engine falters with much less fuel coming out. I'm thinking it has a clogged injector on #4. Any other tests specific to a Mercedes 2.2 that I should be doing or am I on track. Also, are these injectors rebuildable? Otherwise the engine seems to be where it needs to be.

Thanks
WG


Whats been done so far to a vehicle that has been DOA for 3 years.
1 head gasket
2 new timing chain
3 All new seals
4 Thorough flush and refill of all fluids