2001gmc jimmy starts and stalls security light stays on

The security light has one job, it warns you that there is a "break" or "miscommunication" in your antitheft system. This is why the Jimmy keeps stalling. The antitheft system cuts the power to the injectors (It's thinking it is protecting itself from theft) and the vehicles stalls in 5 seconds or less after starting. They are also known to stall while driving. Followed by the security light. The SECURITY light will either flash or stay on solid. A solid light normally indicates a bad Theft Deterrent Module, this is the brain of the whole system. Go to this link, it has alot of info stuff that should help you out.

http://vatspasslockpasskeysecurityhelp.yolasite.com/