I don't know why you're having so many problems with this mod (seems to be a trend... *cough* struts *cough*), but my Skunk2 installed flawlessly. I use a GSR fuel line that runs from the filter to the fuel rail. Remember to use Teflon tape on fuel fittings so they won't leak. Also, why would your GSR TB cause problems with your idle? I use a GSR TB on my Skunk2 manifold and I have no problems... seems to me that you may have a problem with the TB gasket. Did you put a new one on there?

DIY: http://www.ff-squad.com/tech/howto/sk2manifold/