Best advice I had seen on here for the 3.8 ( I had one) but also works for the 3.6.
Run it like you stole it. Treat it like a race motor, not a 4x4 motor.
Let it rev. If you try to stay in the 1K - 2K rpm range, life will suck. One you break 2K they are almost normal powered engines, and with the 3.6, especially above 3K, it comes to life