Hello everyone. Last Thursday on my way home my trailblazer stalled while stopped pulling out of a store parking lot. Tried starting it back up and it would just crank. Tow driver got it to my house and hooked a power pack up and it started up again. Once he unhooked it, it stalled. I purchased a new battery the other day. Replaced the battery, it started up but stalled after about 5 seconds. And again, won't start back up. Not sure if it was coincidence, but that same day on my way to work, my left blinker was flashing fast. But eventually went back to normal later on. Sensors? Regulator? Pump? Starter? Ignition? Not sure where to start without dumping hundreds of dollars on parts that it may not need. Thanks for any ideas everyone!