Okay, at the FL-CEG meet back in October, we cleaned my UIM and LIM, but bent the EGR pipe to a weird angle trying to take it off. When we tried to bolt it back in, the bolts cross threaded into the UIM

. I went and got a tap and new bolts to thread it in, we re threaded the hole, bolted it in, and it ran like a champ. Now I've started to notice that the EGR valve is backing out of the manifold. I pulled the bolts out, and noticed the left hand side was too long. I grinded it down about a good centimeter and it bolted in nice and tight, however the right one (which just has a hole that goes straight through) will not tighten down. I can screw it in all the way to where it [b]should[/i] tighten up, but the bolt will just spin in the hole and not move any.
What should I do? It's leaking massive air through.
Any help appreciated
-Chris