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I have been chasing a similar condition in my 240 for a while now and still haven't licked it. But my solution might not be yours anyway. Yours doesn't sound lack of air or spark, which can both mimic rich mixture. Your problem could be a leaky injector (as could mine), but I don't know how to test that. It could also be your cold start injector and I hit on a way to exclude that as my problem. I pinched off the fuel line between it and the fuel rail and it made no difference for me, but it might for you.
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Andy '91 745 184K, '89 244 134K, '87 245 lost the rust battle at 225K mi
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