faults with vy clubby, engine missing

[tmdestruction]

got a problem with my vy clubby, i put a new engine in and it ran fine for the first 1000kms. now its throwing some codes and runs really rough and really gutless. codes are: p0131 02 sensor circuit low votage.
body faults:
73 spark retard monitoring data link.
72 serial data link
64 tps signal.

ive swapped the tps and both exhaust sensors with my ls1 ute which has made no difference.
help is greatly appreciated as im lost as what else could be wrong.
cheers

[Muzzytt]

sounds like a bad earth somewhere .