"My vehicle will remote start fine but then it immediately shuts down exactly like as if someone stepped on the brake pedal although no ones in the vehicle. What could cause this?"
ANSWER: The two most common problems that can cause this situation is #1 (which is the most common) Somehow the remote starter's bypass interface kit lost it's programming and will need to be reset and reprogrammed to the vehicle (how this is done depends on the model of bypass/interface kit the installer used when he installed the system) or #2 the remote starter system's "tachometer input signal" need to be reprogrammed to the remote starter system (this procedure also depends on the brand and model of remote starter system).