Already the problems start...

As some of you may have noticed, I bought a '94 Pathfinder back on the 22nd of Oct. http://brewcitymuscle.com/forum/showthread.php?t=16758 Well, one week later the y-pipe cracked in half, there is a grinding coming from the right front on sharp low speed turns (prev. owner said a cv joint was replaced last year) and when the engine's cold, it tends to hunt a little bit in the rpms (sounds almost like a misfire).:mad: So, any suggestions on where to start for the grinding (first thought was the cv joint on the opposite side as the one that was replaced) and the misfire (fuel injector, maybe)? Thanks for the help ahead of time!:thumbsup