You may have some other issues which might not be cured by swapping out the EHA. One step at a time!

What other things can I check? So far all six injectors+seals have been replaced as well as the fuel pressure regulator and accumulator. I put a set of Beru wires in and a new set of Bosch plugs except the dealer gave me HR9DCs instead of H9DCOs. I suppose I should try to swap them for some non resistor plugs but I don't know what will work. I can't find H9DC0s anywhere. Something tells me this is more of a fuel issue anyway. It seems hard to get a M103 to run smoothly!

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1989 300CE