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Try taking off the negative battery cable for about 60 seconds to reset the ECM...and then hook it back up. I have a parasitic drain on my 03 and if the batt gets too low and I try to start it, it may start but I will have the problems u have till I rest the ECM again.
My 2005 Yukon doing same crazy stuff . I ended up taking pos. And neg. Off battery. Waited 30 min then touched the two together hooked back up battery and restarted engine . Everything been fine since. Hell of a lot cheaper than bringing to dealership to reset bcm.
 
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