Yeah, I need to get a tune very soon. I'm almost positive the previous owner was using nitrous since I found wires tapped into the MAF, IAT, there were pillar gauges and three random switches. So I'm curious if he had it tuned for aftermarket parts he may have removed.
Either way definitely need a tune, especially with all the upgrades I've been making. Thanks for the tip.

 

Just wanted to say, my idle issues have completely gone away now.
After replacing my vacuum lines, cleaning the TPS and IAC, drilling the IAC hole bigger and fixing a broken wire running to the IAT sensor, it finally idles perfectly now.

Now onto my other problems... lol

 

Try a different stock TB to help isolate the problem. I know removing the screen can screw up the idle. Are you throwing any codes?