Stalling can be adjusted by increasing the idle speed, brass screw on the left side of the throttle body, also you can adjust the tps but that is a little bit more complicated and you will need Kev's assistance.

A fuel mixture that has become too rich can be altered by using the dash buttons as explained in the fuelling fix but what you might need, if all fail is to fit a Kev Mod, see this link here http://www.captnmoto.co.uk/20603.html

you can make it yourself if you are good with electrical elements or you can buy one from Kev directly.

Also note when you fit after market cans, your bike will naturally burn fuel better and faster, which should be compensated with a greater air intake, and it is advisable to fit after market filters such as K&N or DNA stage 1 & 2.

Before you do anything read the Performance thread like a bible.

Good luck