First my Silverado was running great. One day I try to start it but battery was weak. I charged battery up try to start and bam!. Start and stall just like a security problem. Things I have done to try and fix. Run two 8 gauge wires to the rear mount battery. Reflash compute. Check all codes with a tech II no code or lights. Loosen up and re tighten ground on block. Please help. I'm a gm tech and with codes and lost of comm of a compute I will be throwing parts.