Have a 2003 Chevrolet Tracker 4wd, 4 cyl and 5 speed that is stalling.?

It could be a few things security system failure. Ecm failure. Or it could be a favorite of my old one. The trackers have a problem with the clutch pedals the weld holding the pedal breaks and then it will swivel but not engage the clutch. The clutch position sensor not being engaged will not allow the car to start finally you get the weld just right and it works. Ot it could be the position sensor is broke as well sticking in place.