car stalls after longtubes install

My car used to stall sometimes, but I got it dyno-tuned and that completely fixed it, now I just had some longtubes installed and the car stalls like crazy. I just drove home from class and it probably stalled about 10 times. It only stalls when I come to a stop after casual driving (stop lights, in traffic...). What should I do?
 
well if you had a tweecer you could fix it very easy but since you dont all you can do is raise the idle, it stalling is the result of the O2 sensors going cold or not being hot enough since they have moved farther down the exhuast this is normal on a car with longtubes. my car when cold idles at 700rpm or so and when it reaches operating temp it idles at 650rpm also what i did to help with to keep them hot was use header wrap and wrap around the sensors 4" both ways.

How far of a distance did you drive it in miles what was water temp?
 
Grady has some info on his site about similar idle issues (didn't he decide to idle in OL to get around it? I think so).

Good luck.