i have a 97 z71 5.7 vortec an i put a crate engine an it ran fine for the fisrt day an on the second day it was like it went into nutreul stoped pulling would only rev up..an i pulled it home now when u crank it will fire up run like 2 seconds then die .could they be related ??i have replaced ,knock sensor,throttel senor,cam senor an crank sensor ,it keep given me code 1345 witch is cam or crank senor replaced both any ideas?