Put a used 2010 Aveo engine in my 2009. Both were LXV Ecotech engines. It starts up fine, runs smooth for 5-8 seconds, and dies.
Timing is spot on. Compression is about 210 psi in all cylinders. Fuel pressure is 55 psi. No apparent vacuum leaks. No codes on my scanner.
My thought is either throttle or crank relearn may be needed, but both procedures require the engine to warm up, and mine won't run long enough.