ltft

first my alternator went out on the interstate and i had to drive back to my shop on the battery, after i changed my alternator i ran efiscan and my bank 2 ltft was maxed out 25% and car kept dying, so investigated and found i had a hole in nitrous line between my noid and nozzle and figured it was sucking in air after my maf so i replaced that thinking that would correct the problem, well it had no effect, now the car will barely idle and stutters and backfire around 2000 rpm but wot "seems" ok but driving around town the car is horrible and it is drinking gas, i pulled 2 of the plugs and they seemed ok, i bought new o2's and will try that does anyone have any ideas what else it could be, i had new heads installed about 150 miles ago with new plugs installed then, car has 10500 miles 222/228 566/571 113lsa cam, ported tb, ported ls6 heads

What kind of vehicle is this? Do you have a wideband? Did you autoVE tune it? The heads came after the cam? I would think you would have to redo the VE tables in order for everything to work after any internal motor changes.

did you bump an injector plug off?