I have a 2000 Chrysler Cirrus 2.4 four. Auto with A/C. I am getting codes P0171, P0645, P1489 and P1490. All circuit breakers and connections were checked. The thought I am getting is that the PCM has gone bad. When it runs there doesn't seem to be any problem until I try to shut it off and then it continues to diesel (not shut down) for two or three minutes then it will finally shut down. The key is not in the ignition. When I tried to restart it, it would not start initially and now not at all. Does my thinking about the PCM make sense. This is an expensive part so I want to be sure.