I got some chips burned for me, and a problem im having is when I let off, it decellerates normal for a couple seconds, then the engine falls on its face and boggs down alot faster then it decellerates normaly, then after it gets to around 1200 or so its normal again (but thats probably because the converter kicks in. It doesnt gurgle or pop or anything either when i let off.

What values in the chip would make it lean out (i imagine its leaning out) when it decelerates? He said he couldnt see it in the datalogg and i dont know what to look for so..
The stock chip doesnt do this.

 

Its probably due to the fact that the ecm zero's out the fuel thats being delivered, basically shutting the engine down when your decelerating.

The thing to look at would be decel fuel cutoff. You could try disabling it, or tweaking how fast the fuel is decayed out. The reason its a problem now is that other changes to the chip may have effected how the decel fuel cutoff works. It could also be other things, like the VE table, or timing being off.