As I posted before my 98 jimmy fuel mileage went down to 10 mpg. Auto Zone checked the codes and found this. P1133 was told this is low fuel pressure regulator. P0300 was told this is coil pack failure P0147 was told this is fuel control shifted lean.
I replaced the O2 sensor behind the cat (bank 1 sensor 3). Took it to AZ and had the codes deleted. After driving it this weekend the service light is back on. Mpg went down to 6 mpg. According to AZ my codes are, P0300 P1133 P1034 P0171
Now what? My thinking is take it to a shop.