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The Volvo/Chrysler ignition can have intermittent failures with the +12V supply to Coil #15.
As a test, jumper +12V direct from Battery to Coil #15.
Leave it there when running (it's just a parallel "redundant" 12 volt path), but disconnect it when the engine is off.
Try it that way for a while and see if the symptoms go away.
Check the wiring over by the left hood hinge too.
Also check the single wire (white or gray) & connector leading to the ICU (comes from Coil #1).
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Bruce Young, '93 940-NA (current), '80 GLE V8 (Sold), '85 244 ti, '83 245t '76 244 (lasted only 255,000Km), 73 142 (98Km) '71 144 (track modified--crusher bound) New 144 from '67 to '78, Used '62 122 from '63 to '67
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