My car is still running rough and has poor acceleration/ or stumbles when I take off from a stop. I have replaced the distributor cap twice within 2 months, spark plugs and wires twice within 2 months, changed the O2 sensor twice, it is a new Bosch O2 sensor, IACV hoses are new, replaced the IACV twice, cold start valve twice, ignition coil twice, ignition control module twice, EGR valve, I even swapped out my KE-Jetronic distributor! I am not getting any codes. As far as I know, all fuel and ignition components are in good standing. I turned the key to the on postion then off and went and cracked open the main fuel line and there is definitely pressure there from the pumps. All spark plugs get spark, I rechecked them at least 10 times. Last night I checked all the vacuum hoses unde the hood and all were fine. Anyone got any other suggestions?

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1990 190E 3.0L