Just wanted to report back that I got it fixed. It turns out that when I put the wiring box with the fuel injector connectors back on, I didn't get it on all the way. I thought it clicked in and when I looked at it later, I would have sworn those connectors were all the way on there, but they weren't. I'll edit the title to reflect that the problem is solved and thanks for the help.

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2001 X5 4.4i