Been trying to sort this out for a week now and to be honest it is doing my nut!
Got a Rover V8 with Lumenition electronic ignition fitted which last year after being stood for a while fired up without any bother. Ran smoothly up until the point where the coil overheated. Replaced the coil and it was fine again until that one did the same. Stupidly I had fitted the coil without a ballast resistor. Mate gave me a straight 12Volt coil and again started the engine but it was lumpy and would not rev without missing. So ordered up a Lumenition coil with matched ballast resistor and tried again. Would not even start this time as when I took a plug out and earthed it the resulting spark was orange and pretty weak looking!
Next I scored another Lumenition power module off e-bay and last night fitted that hoping that it was the module that had gone down. Nope still the same, weak spark although the engine does now feel like it wants to fire up.
So checked the voltages and have 12V where I should. Redid the engine earth lead, gapped the plugs, cleaned the rotor arm and cap, replaced the HT leads and still no joy!
Now run out of ideas other than replacing the distributor but wanted to see if you guys could shed some light before going to the expense of changing it.