1993 Mercedes-Benz 300D Questions

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how much does it cost to have the fuel injectors changed?

this just startrd a buzzing inside of car gages dont work lights wont work park light dont work brake light stopped working

Does the computer [brain] have anything to do with the injector pump on a 1993 300D 2.5 mercedes? The two wires going to the injector pump, I know one turns the pump on what does the other wire do... I still am having problems with no power under pressure... sure could use some help and suggestions. I also need to know the torque setting for this car...

my mercedes starts great but when I try to go up a grade or step down on it it doesn't have any guts or shift down... when it is cold, just starting out, sometimes it runs right , but when it warms up it is gutless again.... love the car but just can't figure it out.... Mercedes garage said it was the vacuum pump and I put a new one on and it does the same thing.... any input would be so helpful ... I have checked vacuum hoses for pressure leaks but everything so far has checked out.. I read a lot of this year and model have the same problem but have never found an answer....

Where can I buy a Transmission Control Module for Mercedes Benz e300D 1997 Body # WDB-JF-20F-6V-JO-334-43,
Part # 021-545-04-32 and what is the price range?