Interesting. Subbed to see what y'all figure out.
First thing I'd do is download the FSM (link in my sig) and see if there is something programmed to delay DRL turn-on (eg, parking brake position as nick654 mentioned). A cheap VOM and the FSM schematics should be all you need.
My wild guess is that you knocked a connector loose or broke a wire while doing the intake R&R.
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