Congrats Ryan! 

Thanks for the call.
OK, I've hobbled out here three times to see pictures and find out just how cool your car sounds Ryan and.... nothing, no pictures and no updates.
I sure hope it's because you are cruising around enjoying the sound and smell () of your new headers.
I feel so bad about this whole weekend it's beyond words.Ryan, if you can switch the wires back to stock for a bit, that may let us know what's going on. I have a feeling it lies with that one that didn't seem to seat correctly. Sorry again about everything. I'll give you a call tonight.
Will a missfire throw a CEL? because it isn't. I could go rent a scanner but I think I would need the freeze frame data.
sometimes it doesn't. when mine was misfiring it was under high load and I could hear and feel it cut out, but there was no cel.
also fors and giggles check the wire order on the coil pack. it will run if its wrong, but not well.
also what plugs did you use? they didn't appear to be the normal autolites that are suggested.
I'll check that. Does anyone have the diagram from the Haynes manual? Scott had one but I don't.
The plugs were NKG Iridium. I was going to go with Iridium plugs either way but the store I went to had NKG rather than Autolite. Shouldn't be a difference, heard they are also good plugs.
how are the iridiums different then double platnium? more times then not people have troulbe with plugs that are not double platnium.
also did you gap the plugs before you installed them?
Ryan, can you take a pic of the electrical connection to the things on the firewall side of the UIM, like the IAC..etc? Maybe one of those connections got messed up? Gotta hate working by flashlight!!! I'll compare the colors of the wires on the connectors to my car when I get home tonight.
Maybe a new set of autolite DP's would help. Let's double check electrical connections first, then go from there.
Unfortunately that description sounds like an exhaust leak. Hopefully not at the header though. Do you guys retighten the header bolts after the first heat cycle/drive?Cool, yeah. I'll check plug wire connections, sensors (is there any reference guide to what goes where?), then try the old plug wires, then try the old plugs. Thats my order of troubleshooting.
The car is also making a weird noise under mid rpm throttle (above secondaries) that sounds like rasp but coming from the front end... hope its not a leak. I've been driving enough between the drive home and work today that any leaks should show up as some carbon build up around the leak. Or at least some visible indication.