2003 Altima 3.5 SE

I have had several repairs lately to my Altima. I have replaced the cam position sensor, the timing solenoid, the manifold catalytic converter, spark plugs and air filter and had a carbon cleaner added to the tank and directly into the engine.

The cat converter was the most recent problem and even though the car was running poorly because the cat had broken apart and blocked the air flow, the SES light was not on. After the cat repair and carbon cleaning, the SES is on and the OBD II codes are showing a problem with the timing solenoid, the cam position sensor, and now showing a misfire in cylinder 3, in addition to somewhat rough idling and the idle now running at about 1000 rpms. Is this a result of the carbon cleaner? Is it that I need to reset the idle? I am frustrated at this point. I have also started having some increased oil consumption, no smoke or leaks, and I'm thinking it may be the PCV valve that needs to be replaced.

I know it's a lot, and it's proportional to my level of frustration at the moment.