Looking for ideas regarding the source of my slight stumble at idle. This is for a 94 M104 E320. I have a slight misfire/stumble at idle, no surging or hunting, doesn't even register on the tach, but it does in the seat of my pants.

Just replaced sparkplugs properly gaped and torqued, new Bosch SP wire set as I noticed the old #2 wire had signs of shorting against the valve cover. Buttoned it up and still have the same misfire/stumble at idle.

All of the old plugs looked nice and tan, free of carbon and oil, so she's running right and under load she responds great, I only notice the issue at idle. Also I have no check engine light or any codes, all clear from that regard.

Although I couldn't initially spot any vacuum leaks I'll keep looking. The injectors seem tight fitting and no signs of a seal leak that I can see. Any ideas of what could cause this?

TIA

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)