I think Stretch will agree with me here, diagnosing CIS is one of the most fun things you will ever don on a car. My 190E 2.6 has been a bear lately and I'm not sure why. I adjusted the duty cycle once already, replaced the EHA, replaced the hall effect sensor, coil, distributor, rotor, plug wires, and plugs, replaced the fuel filter, and it started running poorly again a few weeks ago and tthrew a code for the oxygen sensor. I replaced that and everything seemed off again. The computer kept on throwing that same code so I replaced it, the MAS relay, and the EZL. I can't currently get the duty cycle to even read correctly at static idle, car smells strongly of gas, and I have found out the air flow meter potentiometer is bad as well as some of the vacuum hoses. I also just replaced the idle air control valve and adjusted that potentiometer as best I could and now the car isn't stalling but idling way high. This is why I am swapping in a 3.0l M103 and converting to Megasquirt.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.