I did the followings:

1. Changed all of the spark plugs (Bosch) and their wires (Beru).
2. Cleaned the fuel distributor professionally.
3. Changed all of the filters u can imagine in the car.
4. Made sure that all of the car electricity r poperly fine.
5. Changed the engine chain and some other parts.
6. Made sure that the chain timing is fine.
7. Made sure that all of the 8 injectors r working properly.
8. Always using original 15/40w oil.
9. Made overwhole for the transmission.
10. Kickdown alignment is fine and working.

The car looks fine but I still don't get the performance I wanted like with my 560SEC 1989.
What else I can do? Please tell me : ))..

__________________
Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

380SE 1984 <------- Totaled by flipping accident
300SE 1988 <------- Sold
Volvo S70 2000 <---- 4 family
Opel Omega 2002 <-- 4 family
560SEC 1989 <------ Sold
560SEL 1990 <------ Sold
560SEL 1991 <------ 4 my mother
560SEL 1989 <------ Sold
600SEL 1992 <------ Current

http://search.ebay.com/_W0QQsassZkhazenzcc