I have a 04 Envoy SLT w/98000 kms and it will not quit running after it has been turned of with key removed. I have to remove the fuel pump fuse in order to get it to stop. It has done it 7 times in a row. I unhooked the battery to reset compu and this helped, now working fine. What could be causing the problem of not shutting off with key removed. I've had the speedo problem already and had that fixed. Just one problem after another.