You have 2 different codes here
- p0138 indicates probable O2 sensor failure
- this can be caused by running really rich from a bad injector - usually screws your cat however, or its an aftermarket shit injector
- p0300 is most likely spark over bad fuel injectors, but...
- ALWAYS pull the...
Personally, I'd pull the upstream O2 sensor off and spray Seafoam down into the catalytic directly - use the whole can.
Check that damn pinhole of a PVC route in the intake manifold - may be clogged and indirectly contributing to oil consumption.
Why did you replace so many parts?
What was the original codes, or were there any?
What do you mean acting weird?
Oil on the plugs - electrode side or just around the plug? ie: intake cover
Have you done a compression check and double checked your timing setup?
Do you have a scanner, can you...
Digging some more here.... Looks like the Chassis control module #52 under hood drives the fuel pump, based on some wiring diagrams I found.
what the hell else does this module do?
Dumbass engineers
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