So I have a 2002 mc I have a flashed pcm from zzp top swapped the problem is that about a year ago when I stopped driving it because of a blown head gasket the radio stopped working right before. it wasn't the regular no sound problem there's no clock no red light but the numbers are lit up. When I put the flashed pcm in and the car wouldn't start the radio was working and then when the car would start the radio went back to not. I had my battery die for no reason after being booked up and not started in 2 days but when I was about to jump it turn the key and the radio was back working any suggestions (it not the fuse)