I'm going to test this tomorrow, but I want to ask first, can this unit be responsible for:

a low RPM (idle-1500) stumble. Bad when hot or humid, better when cold and dry. Stumbles till 1500RPM then suddenly smartens up but misfires throughout the rpm range. Idles rough on a tank of Regular fuel, smooths out considerably on premium, but still misfires..

When it gets really bad it seems like moisture under the cap, so I once sprayed it with WD-40 and it stopped it. (I also sprayed the switch gear a bit)

Just want to know where to focus, even if it doesn't indicate an ignition problem.

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

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