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Turns out ... for others that may be looking for an answer that it was the PCM.

Some how my 02 Navi has decided my two keys don't work anymore or the fob or the door pad to turn off the anti theft. I turn the key and it will turn over but not start. I have a flashing theft light that after a min or so flashes once then six times. Is it a trouble code? If so what for?

I have an LS V8 that's running very rough , mostly at idle , and sluggish through all the gears. The car actually shakes from side to side at idle. I ran the codes and the ones that popped are: P0171 P0174 P0430 P1131 P1151 Any suggestions where to start? Its Christmas time so not a...