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Unplugging the hall will put the ECU use some emergency timing for ignition etc. Apparently things will be messed up if the hall is in use and does not give reasonable input, but if it's unplugged the ECU won't even try to use it.
Found the problem. After testing both crankshaft sensors, hall sender in dizzy and Ignition amplifier, the last item left in the equation was the ECU. Swapped out the ECU from my car and it ran (sort off). Basically what it was doing is triggering mutiple primary signals to the coil. With the ECU unplugged it stops.
Recon unit on its way!
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Tom C - www.rcmr.co.uk
Audi UR Quattro
Audi 100 C3 2.0 5 cyl 115ps
Audi S2 - 07k engine project aiming for 800ps
Audi B5 RS4 645ps 911nm
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hope you haven't upset my pet squirrels, while you've been poking around the engine bay 
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