same thing here, with added throttle it stumbles for a number of seconds, then smooths out and is fine. without any throttle application, it dies immediately once, then will start without throttle app on the second try. i have had this problem for at least 100k miles and have never been able to figure out what it is. fuel pressure is in spec, replaced injectors several times to no avail, fuel pump replaced to no effect either.

at this point, i figure the only way to get rid of this problem is to get a crate motor.

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Jonathan
1998 S600
2001 E430
1994 E320
1991 560SEL
1994 Turbo R