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Almost sounds as though your CIS U computer is kirking out on you.. Had a VERY similar problem in a 560SEL of mine, played with injectors, fuel pumps, accumulators, regualtors etc.. Finally swapped the CIS E computer and it fixed EVERYTHING. Do you know anyone with a 560 that you could swap a the bugger out with??
Sometime you can get a cheap used one on ebay, new they are over 700 :-/
Good Luck!
Jonathan
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