Car won't start once again

[blownGP]

OK I've got another problem. 2 days ago I noticed my car was cutting out on me during acceleration. I didn't have time to look into it and kept driving. Then yesterday it struggled to even get me home. Today it quit twice pulling out of the driveway so I just drove something else and now I get home with time to look at it and it won't start at all. It says full boost all the time even when it's off. It goes from saying a single cyl misfire to multiple cylinder misfire so it's not just cylinder 3 it's all of them at one point or another. Any help would be greatly appreciated!

[Scottydoggs]

http://engine-codes.com/p0641_pontiac.html not a good code. if you have a open cone filter and the pcm laying there look for a rubbed wire to the pcm. or any other rubbed wires.

make sure the battery and grounds are all tight and clean too.

[02NavyBlue]

After that, pull a connector on one of the 5 volt sensors and test the v-ref wire. Should see 5 volts. If not as he said check all the wiring. Then start pulling all the connectors for the other 5 volt sensors and see if it comes back after pulling a connector as one of the sensors could be shorted. Worst case the pcm's 5 volt control has failed.

[blownGP]

Another set of plugs and wires and it's fixed