new dizzy cap rotor arm now juddering

[CMF_matt.d]

i put on me micra a new dizzy cap and rotor arm and put in new plugs gaps adjusted 1.1mm etc now the bloody car judders every now and then doing me head in whys it doing this when it judders every now and then the engine management light flickers very briefly not flashing

 

[CMF_frank2]

sounds like a loose connection somewhere matt, i would check all the electrical plugs

 

[CMF_matt.d]

connection checked and rechecked but guess what the rubber seal gasket is shafted so i silicon sealed it in and the dizzy has a crack around the screw holes where i overtightened it would this cause a spark leak and me problem