[Fasterthanyou]

I concur with Injuneer. The 51 error is really odd and might require the flash chip to be desoldiered from the board. If so, and you do need a new ecm let me have this one and I'll see if I can repair it.
As for the other 2 errors, sounds like you forgot to hookup a control wire between the ignition module and the pcm. This would cause the ignition to go into backup mode and run very mild spark advance with crude "slopes". The major problem is the 51. What's happening with a current code 51 (the code does get stored for a while) is that the pcm just uses the RFD (bunch or resistors) to do the fuel calculations.
Pull the pcm, get a multimeter and do the voltage/resistance check on everything according to a service manual. That's always the easiest way of chasing down a wiring problem.