Oh bugger! Just changed all the seals (one thin o-ring and one thick o-ring per injector). Used silicone as lubrication.
The car still runs ****, and it won't even idle now!! It's makes a little whistling noise when the throttle is moved abruptly.. The injectors and the slots in the cylinder head were also dirty as hell! Didn't really clean the dirt in the cylinder head, as I didn't want to get grit in the cylinders.. What do I do