Sorry I forgot to add this. 1992 300E with 50,000 miles. The acceleration problems seems to be getting worse each day. Injectors and seals are new, distributor cap and rotor, plugs and wires new, O2 sensor new. IAC valve seems to be working. Will be installing new fuel filter and OVR next week. Would a failing EHA or ignition coil be suspect? What else. Starting to be concerned about total failure and be out on the road somewhere.

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Handyjay