Would anybody know what to change in a Tweecer Cal. to lean out a 4.6? I have taken off the cats and it runs a little rich . Any help would be nice , Thanks.
First before you change anything, do you know for sure you are running rich? Gas smell is common with no cats and most people assume they are running rich because of it. I wouldn't reccommend drastic a/f changes without runing a wideband.
With that said, there are several ways to change a/f, but the best way to go to the stabalzed open loop fuel table. The stock values across the top row (which is 100% load or WOT) are 12.5 and 12.0 These are the commanded a/f ratio values. You can change the top row to 13 across the rpm range if you are n/a.