I have a 2000 gtp with 116k on it and just recent I have been problems with it shutting off while im on the highway. The rpms would shoot up to about 3000 then down to 0 and shut off. After about 5-10mins I was able to turn it back on and drive it home. I noticed I had a cracked vacuum line that i temporally taped till I was able to get it replaced. I brought it into the shop the next day and they checked it out, They found out that my wire harness had started to melt on my exhaust manifolds. So 450 bucks later they fixed the harness and vacuum line. Seemed like it drove a lot better but omw home on the highway it shut off on me again except there was no sputtering just completely shut off and lost all power but was able to start it up once I got to the shoulder. Im gonna take it back tomorrow but any ideas on what it could be? Thanks in advance!