Hi chuffsy,
Right off the bat I would suspect any of the ignition parts - plugs, wires, rotor and dizzy cap. Look for any wear and check continuity with multimeter. But I wouldn't suspect the coil, its quite robustly built in order to supply 4 plugs, unlike nowadays coil over plug arrangement.
Secondly congrats in installing the VX camshaft. I have one from IPD too. Better than the previous M type. No issues after installing mine, only that I don't have adjustable cam sprocket. I think it may be well to set advance back to zero (default) while you settle the current issue.
Mine 1994 940 NA Bosch.
Amarin.
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