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+1 to miguel, it doesn't help much to crank these older cars and let them idle while in storage. Probably no real harm done aside from sooting up the plugs, valves, and possibly a little fuel dilution in the oil... The detonation was probably from heat soak in the intercooler. The longer a 930 idles, the more heat gets into the intercooler core. It's always best to make several light throttle, but high RPM pulls to move a lot of air through the core, before making any hard accelerations after extended idling. I've been guilty of the same thing in several different 930's. The intercooler gets HOT w/ no considerable airflow...
As for your running problem, I would run a really good CIS pressure test, and replace those new plugs, again. Once they have been contaminated, they are never the same, especially if they ever misfire and leave a carbon trace...
Good luck!
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Professional Overcomplicator
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