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I just had the same problem with my 84. I'm not sure what year yours is but as long as it's not a 78, 79 or Euro CIS machine it will most likely be your thermo temp switch. It is mounted horizontally just in front of and below the temp 11 switch. The thermo temp switch fires up your cold start injector on ignition. It it fails then you have no cold start injector. The temp II upon failing will cause rich running because the cold start injector won't shut off at all.
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1979 928 5sp project
1984 928S 5sp black on black
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