If it is you lower intake manifold and upper intake manifold, I just had the same problem and changed the LIM and UIM. First time I every had to do something like that too but I did it and everything seems fine. Just did it Saturday. My dad and I did it. We both watched the video a few times. You only need sockets, wrenches, a torque wrench, a gasket scraper, nothing major. One of the guys that was posting to me about having super glue in case you break a vaccume line, which I did. Glued I back up and is fine now. Another good idea is to label everything, it takes time to do it but you don't want to forget what connects to what. My dad brought a small book of A-Z labels and they are maybe 1/8" wide x 1" strips and you can wrap them around the parts. Heres my thread, I was given good info on parts and some procedures to do this job.
http://www.grandprixforums.net/f81/c...ine-29376.html
Took us about 8 hrs to do, almost 2 of them was running around to parts stores because we messed up an o-ring. If you decide to do it, message me if you need any help. Its still fresh in my head. The guys in my thread seem to know a lot too so they may be more helpful. Sliver GTP in the above post was one who gave me good info.
Oh and make sure the coolant sound isn't coming from the overflow tank if its low. Because I was loosing coolant my overflow tank would get low and I would hear a gurgling too, as it was trying to suck more out and couldnt. After I put more coolant in the overflow tank it would stop til it got low again. I was thinking it was my heater core too but never saw any signs of it being bad. That what I found on mine but I guess I still could have a heater core problem too.
