I had a mechanic replace my engine last year in my 99 w140.The donor engine came from a e class with a throttle that had a cable.Since then I have always had hesitation at a stoplight.I'd like to fix this.Any ideas,all ignition parts new,an cranksensor.Oxygen too,new MAF.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran

Check the fuel volume might be low, pressure is probably good but fuel volume low.
Had this problem on a 1994 E320 bad connection at the fuel pump was the cause of low fuel volume. When i tested fuel volume I used a fuel pressure gauge with a drain port connected to the schrader valve do not remember the spec but it was way off.

yeah I do question the fuel regulator,pump,and filter new.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran