Xanatos
Don't forget to look at the most obvious things.
Always make sure when you do anything different to the maf air flow you make sure you disconnect the neg cable for 15 minutes after installing anything that is going to change air flow to the maf.
You need to reset the codes to the air and fuel ratios so the computer knows that there has been a change in flow and adjust accordingly. And this is done by disconnecting the neg cable.

Good Luck!! <img src="/forums/images/graemlins/cheers.gif" alt="" />

Ruben