[VintageLambo] My Jarama quit running, any ideas ?

Hello! I am the new one on the list and I am mailing from Finland. I suppose that there is´nt plenty of other guys from this side of the world on the list. I have -71 Jarama with the same kind of problem. I found out that there was problems with my coils and battery. the engine was´nt running particulary rough. It just slowly stopped running. This happened mostly with lower revs.(idling). It did´nt start at all without extra power. It turned over easily with one battery, but thats all. Battery was quite good and there was´nt any problems with the alternator. It started to run immeadetly when I gave a little bit extra power for it. It stopped running after couple of minutes when I took another battery away. They measured that the coils were broken. When the coils warmed up enough, the engine stopped. We had a same kind of problem with Mercedes 300 SEL -68. Those weak coils and too small battery together made the spark too weak. I hope you understand what I tried to say with this english.. Jukka