Replaced leaking EHA & plugs... 86 300E still running rough..
 

I had sincerely hoped that replacing the leaky EHA valve on my 86 300E would solve the running issues. No such luck...
The engine still have a rythmic 'miss' (galloping?) at idle, and stumbles badly when I punch the gas. The engine only smooths out above 4K RPM. The car is essentially undriveable, since any load on the engine causes it to stumble and stall.
I know the O2 sensor is bad, and I have a replacement that I will install soon. Beyond that, is there anything else I can do solve this problem?
For reference, the following parts have been replaced:
-EHA Valve
-Spark plugs
-Cap, rotor & wires
-Fuel filter
-Air filter

The coolant temp sensor checked our OK

I've read a few threads about probing Pin 3 of the X11 connector. Will this tell me anything about my car? I've heard the term Lambda mentioned... does this apply to my car (86 300E?)

Thanks,
Mika

If you merely replaced the EHA, you're not done yet.

Go to the following URL, then select "evaluate electronic engine controls".

There is a do-it-yourself section at this site. That's what I'm pointing out.

http://www.peachparts.com/Wikka/DoItYourSelf

Great link, thanks!

On my car, should I see the 70%/30% duty cycle with Key On/Engine Off?
What should I see with the engine running?
I'm not sure how this Lambda thing plays into things, since mine is an older car.

Mika