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Brad there was a pretty 'famous' picture here on the C5 Forum a while back, that illustrated just how much debris could get up in between the radiator and A/C condenser. I thought I had saved it, but I can't seem to find it. It was definitely a classic.
I did find a couple of pictures I had saved that were pretty graphic so here goes...
Do check up in between them and check to see what all (if anything) might be there.
One thing I did add to my C5 was this air intake debris screen. Can't seem to recall who I purchased it from now.
Unfortunately ECS stopped doing that. Worried about the EPA rampage. They still tune cars but not via mail order. It will be interesting to see what the rest of the gasoline tuning industry does.
Aside from that everyone has come up with the typical things to check. Will sit back and see if the OP figures it out.
I just had one done for a friend's 2004 a month ago. Must be very recent.