1989 300E

Should the EHA be controlling anything during cold starting? I'm trying to track down a running issue. It'll start cold (reluctantly) surge a few times and stall. If I touch the gas pedal, it'll stall. My plugs tell me I am running rich. It all started when I adjusted the EHA to try to remedy low end power issues. It started missing on #3, so I adjusted it back to no avail. Any help would be much appreciated. Thanks!

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1989 300E 144K