I my ran the engine at idle for 30 minutes and it showed a steady 5.8 bar of fuel pressure. With the engine off, pressure dropped to approximately 2.7 bar and held steady at that level for over an hour. The pressure gauge showed no leak down within one hour.

Background: For years this car has had a periodic "low idle" hot start condition where the engine would always start but want to die unless I kept the idle up with my foot on the accelerator for several minutes. That has worsened to the current "no start" hot soak problem.

I always suspected some temperature sensitive electrical component was causing my periodic hot engine, low idle condition. With this as background, what should I check next and how?

Thank you.

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Jim Herold--Current: 1987 190E 16V, 1999 ML 430--Past: 1971 280 SL, 1972 250