have you still got your old coil packs or can get a hold of some. try swapping the coils out again for your old ones or 4 known good ones ie from another car.
check your earths as well and make sure your ground is going from the coil pack harness to a direct ground under the battery tray.
http://forums.vwvortex.com/showthread.php?3639849-Suggestions-MKIV-Jetta-Wagon-2slo-Ignition-Circuit-Open-Circuit-Problem
I still have the old coils, I will try them tomorrow.
not sure about the ground because I have already completely removed the the loom for coils,injectors and all the sensors and found no problems. should I connect the earth for the coils to the battery earth
