I've noticed lately as the temps drop here in Canada, that my engine, if I get in fire it up and go, it's rough acceleration, and rough idle at all times, even when the engine temp has reached 80*C.

If I start it up, and let it idle till it warms up to 80*C it'll run smooth with lots of power. Also, in the first instance, with the rough idle, if I turn it off hot and go into the store or something and come back out it runs smooth with power as though I had let it warm up when just 5 minutes ago it was feeling like 7 cylinders...what gives?? WUR? AAV? or some ignition thing? I have new plugs, new cap/rotor but old wires.

Oh yeah, RPM in D drop to ~510-520RPM REGARDLESS of N idle speed. For me to achieve a loaded (in D) idle speed of 650, translates to a free idle of roughly 1200-1500 RPM. 2000RPM cold start up.

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RIP: 80 300SD
RIP: 79 450SEL
2002 E430 4matic (212,000km)
2002 ML500 'sport'

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