Well i got the SD back from the shop after complaning that it was runnin like a snail and they said that a fuel injector was bad..and that they cleaned it out but did not replace it.. and i still have a low idel and sluggish 0-45mph..
Is it hard to replace the fuel injector?
if so is it costly?

One of mine for the 420 was around $200..

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'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)

I bought rebuilt Bosch injectors for $45 here in LA. I have an 84 300sd.

After replacing the injector, I'd also have the fuel mixture set a little richer. This will give more power.

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Benzmac:
Donnie Drummonds
1991 GMC Syclone
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM