I had a similar problem that got progressively worse until the car would crank, but not start. It turned out to be an internal leak in the fuel accumulator. Search for a thread started by me: Fuel accumulator failure analysis, and run the simple acculumator leak test.

I still get the occasional starts and then stalls behavior, but I don't think there's anything wrong. This has been going on for years, and I just got into the habit of kicking the throttle a bit when it first starts, and with that procedure, it never stalls.

Duke

After adding another dose of fuel system cleaner the car is still hesitant when first trying to start it if I mash the gas a few times while cranking it will start first try so this is deff a fuel issue

Did you use redline?

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Eugene

10 E63 AMG
93 300te 4matic
07 BMW X3
14 Ford F-150 Fx2

I did use redline but I'm still having issues. I think Ima pull the injectors to test them I hear it's common in these cis systems for the seals to go bad n drip down causing the symptoms I described are happening to me

duke26 Did you check the fuses ,give them a turn in there holders. Eath points ,clean them up re fit them with grease on the threads .