I'm new to this board and to these cars. My daughter bought a 94 gt. The person she bought it from said it needed a fuel pump, which I installed. The car will run good and then will not start. After it sits for awhile it starts. I got this code, Code 543-fuel pump secondary circuit failure - battery to pcm. It doesn't miss or surge going down the road but when she shuts it off, sometimes it will not start. Am I correct thinking that the PCM is going bad? Thanks for any information.