Mercedes Benz repair: hesitation, fuel pressure regulator, vacuum leaks

Question
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Followup To
Question -
1989 mercedes 300e.  I have replaced the fuel distributor, fuel pumps and filters, all the injectors.  There seems to be an aceleration problem.  from 600 rpms to 1500rpms its real slugish but over 1500 it runs great.  Just at the stop signs and stop and starts ist real slow to go thru the 1500rpm. The timing is fine.  What else do i need to look at.  The injectors are all new and clean.
Thanks for the help  just looking for ideas.

Answer -
Your car needs to be checked for a plugged catalytic converter.

Ok what next.  checked that and they said it was fine.
what else can i look at.





http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=merc

Answer
Things to check:
#1. Vacuum leaks.
#2. Alternator...
#3. Ignition Coil...
#4. KE Control Unit
#5. Reference Sensor...
#6. Voltage Regulator
#7. Fuel Accumulator
#8. Fuel Filter...
#9. Fuel Pump Check Valve
#10. Fuel Screen...
#11. Fuel Tank Vent Valve...
#12. Altitude Sensor...
#13. Cold Start Valve
#14. Cold Start Valve O-Ring
#15. E.H.A. Valve
#16. E.H.A. Valve Seal
#17. Fuel Pressure Regulator
#18. Idle Control Valve
#19. Oxygen Sensor
#20. Throttle Body Gasket
#21. Throttle Microswitch
#22. Water Temp. Sensor...