1998 XJ8 Restricted Performance

Hello All,

I have a 1998 XJ8 that I bought after it had been sitting for about 5 years. I have had to replace the Fuel tank, Fuel pump, Transmission Neutral Safety switch. I have had the alternator look at. All it needed was new brushes. I have put a brand-new battery in the car. 

Before and after the new battery I am getting battery not charging intermittent. But testing at battery I am getting 14+amps

Before and after I had the alternator worked on, I get Battery not charging intermittent. But testing at the battery I am getting 14+amps

I heard cutting the gray wire to the alternator and putting alternator output power to it would take care of battery not charging. It did, it is still intermittent. 

So I still have the Battery not charging intermittent

After car has been disconnected from battery and all codes have been cleared, you start it one time. Take if for a drive it will have about 50% power with and without sport mode button and with no error codes coming on. if you shut it off and start it right back up and take back off it seems to be full power, with and without the sport mode button still with no error codes. 

I cannot seem to cause the error codes to come on. I cannot find a reem or reason. But the "Restricted Performance" comes on codes

P0172 System to rich (bank 1)

P0175 System to rich (bank 2). 

P0172 System to rich (bank 1) - Pending

P0175 System to rich (bank 2) - Pending 

P0132 O2 Sensor Circuit High Volts (Bank 1 Sensor 1)

P1000 Manf Cntr Fuel&Air Metering, Auxiliary Emission Controls

P1643 Manufacturer Contrl Auxiliary Inputs Auxiliary Outputs

It is still drivable; you just cannot get on it hard or it start jerking. but if you clear the codes with code reader. You can do the 2 start and be back to full power and maybe drive 10min or all day before it errors out again.

Has anyone had this happen or any idea what I should be looking at. All input is welcome.

Thanks.