First, let me say that I've done a great deal of reading already and have learned volumes about this car compared to what I knew before finding this site.

Car: 87 300E

Symptoms:

Car idles fine in P and N, constant 650+/- 50rpm per MB specifications

However, idling in D and R is a constant 500rpm now after playing w/ the mixture a bit. Previously, had touched EHA setting (per another thread advice, terrible idea). As a result, my mechanic (who is an older guy that has several of these cars) adjusted the mixture to make the car idle perfectly in P and N, but D and R were rough and stumbled on acceleration. Now, w/ the new EHA, the car idles at 500 RPM in D and R, but doesn't stumble on acceleration. The Economy gauge isn't measuring properly and the engine doesn't sound right with the low idle, like it is going to stumble.

When I asked my mechanic about it, he said the problem was linked to the transmission wanting to drive the car and the engine not being able to do so, thus a rough idle - and "these cars always have idle issues".

I don't really know what else to do, but can tell you that I know the car needs motor mounts (which may/may not affect idle, or so i've read), and can't seem to find anyone w/ the same problem as me - there is no surge to 1k rpm, its just a low idle with the economy gauge all screwy.

Should also note, the car drives fine right now, but doesn't seem to have all the power it did before i replaced the eha valve tonight.

Whats been done:

-checked for vacuum leaks at breather hoses
-replaced cps
-replaced cap/rotor/plugs
-replaced EZL module
-replaced EHA
-played w/ air/fuel mixture
-replaced OVP
-replaced FPR

Thanks for your help.

__________________
87 300E
202k on the clock