I have a 2005 Envoy XL, with a 5.3. I installed a new TCCM. After I was done, for the first couple days, once in a while it would not start. As in, you would turn the key and all dash light would come on, go to start and nothing would happen. Lights go out, nothing happens. Try it a. Couple more times,and it would start right up. Battery and starter, good. Now it won't start at all, and I can't get it out of park so I can move it. Brake lights work. Won't turn over, and can't get out of Park! Help!!