hi auke,
first check/change the intake manifolds/sealings. if there is a leak the carb cannot provide a proper mixture.
second, as grant already mentioned, checking coils only by resistance measurement is somewhat tricky. you have to consider that the coils are contaminated by hot engine oil while engine is running. if the isolation of the coils is faulty, errors might occur only under certain circumstances.
easiest would be to change the whole left engine side-cover assambly against a functioning one (hope you know somebody who is able to help you, you can use as well any 34L, 43F and with some mods 2KF/NF). you can change also the cdi-unit but in most cases errors result from faulty alternators.
if the alternator is faulty, coils can be rewinded. in germany we have some workshops who are specialized on this job and they perform a pretty good work, better than original with one year guarantee.
and last: there are also reports about loosened parts in the silencer which can cause similar problems.
good luck!
klaus
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