Where did you get
> > your MOD chip and how much?.I've had my jumbuck for 1 year and 2
> weeks

Careful of these so called "mod chips" some that claim to trick the
air intake temp can be no more than a 10 Cent resistor in fancy
plastic.... see the following links

http://forums.justcommodores.com.au/archive2/topic.php/11998-1.html
http://www.performanceprobe.com/extras/ebayscam.htm
http://installuniversity.com/install_university/installu_pages/sophomor
e_year/timing_tricker_mod.htm
http://rogueperformance.com/IntakeAir.html

theres another one i had thats better than these links, but basically
you will get the picture - save youre money!