My mother has a 1999 E430, and she had a very similar problem as yours.

Replacing the crankshaft position sensor solved the problem.

Suggestions:

1) Fuel pressure regulator (relatively inexpensive)

2) Try a known good throttle actuator

If the above items have been eliminated as possible contributors to your "hot/warm running" complaint please let us know. I have a few more thoughts but if I were working on this complaint I would focus my attention on these two areas. :sun_smile

m104
 

The crankshaft sensor went south on mine and there were no codes,this was a 129 though

Perhaps you can enlighten the forum regarding your progress....................

Always :cool: