I have a suggestion: remove the air cleaner housing and tap on the side of the throttle body with a metal hammer or wrench.....something that will give it a good knock. Not too hard, but not soft either. Do it with the car off, then if nothing try it with the car on. If that does not work, turn the car on and unplug the eha....I understand you have 10 seconds so it's best to have someone crank it over for you. If the car runs with eha unplugged, leave it unplugged until you can source a working one. If car runs after knocking throttle body, remove the fuel distributor and the throttle body (only remove the tb if you have a gasket to replace the one underneath. Auto zone sells the sheets of gasket material which is what I have now. Works great.) Once the tb is off use carb cleaner to clean the dirt from the moving parts then lubricate moving parts with transmission fluid, per the mb fsm.

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1990 190E 3.0L