Mine was about the W124 idle surge and hot start problem...

...the OVP recommendation solved the hot start immediately...still scratching my head about the surge (which comes and goes), but I was sold on the sage forum advice, and much has been repaired for thousands less than it would have cost for me to have the dealer sort it out!

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car