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I think the hex screw is spring loaded so it needs pushed down to engage.
It's real hard to guess without a duty cycle reading... once you get a meter you can use the links in my sig. to see the factory instructions for reading at X11 (the diagnostic port)... actually even with a reading it's no sure thing but it will tell you what the lambda system is doing. Could be a failing EHA (back of the fuel distributor) of a vacuum leak getting worse somewhere, a faulty fuel pump relay... ...
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