This produced ASTONISHING results! I have been struggling for months with my '88 300CE that, once warmed up, sputtered and backfired every time I accelerated from a stop or at any time it was below 2,000 rpm. It would almost cut out unless I floored it and it often stalled as i was coming to a stop. It was not safe to drive in that condition.

I replaced the plugs, wires, vacuum lines, distributor cap, rotor, fuel filter and injectors. Plugs helped somewhat, nothing else impacted the problem. My next attempt was going to be to change the Overload Protection Relay, Coolant Temperature Sensor and O2 Sensor. I ran across this post and in 15 minutes I adjusted the EHA exactly as detailed above and had my fix. Smooth as silk acceleration once again! Thanks...