The first thing to do is to forget that it ever ran properly. That fact has nothing to do with what is wrong. What is wrong is what is wrong and someone needs to figure it out.

If you think electrical control is involved with your problem disconnect the EHA. It will make it harder to start but the car will run just fine without electrical control if one adjusts the mixture. Once you have driven it around with it running fine, then return the electronics to control.

As always the first step is to determine fuel pressure.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician