OK, here's an update. I cleaned the throttle body, but that didn't help at all. I also cleaned the MAF Sensor because along the way one of the codes I saw said something about mass air, so I thought it couldn't hurt. It didn't help either.

The next thing I tried was to swap the ignition coils from cyls. 1-4 with the coils from cyls 5-8, since according to the codes I had, all my misfires were on cyls. 5,6,and 8. After switching the coils, I only had 2 misfire codes(cyls 5+6), instead of 7 codes like before, but it's still running really rough.

Does anyone have any more ideas on what I could try next to narrow things down? Thanks.

Also, as far as the coils being "seated" properly, I noticed that when I removed them, there was a small "pop" like everyone talks about, but when installing them they do not "snap" in place, they just sit on the plugs. There is a spring action there in the sense that if I push them all the way down and then let them go, they "spring" up about 1/4" or so until I put the nuts on and tighten them down. Does this sound normal for the coils?

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2001 X5 4.4i