A little help with codes/ & I/M Monitors please

[Randy K]

Hey guys, hope everybody has had a good weekend. I have fixed the camshaft sensor, and the two rear O2 sensors. Now I get codes P0430 ( bad cat $$$) and P0507 Idle too high. I tried reset procedure 3 times and it's down to about 900. Still out of spec but closer than it was. I'll do it a few more times to see if it helps any more and also check the timing to see where that is when I get a chance. But I also have some I/M Monitors that I'm not sure what exactly they mean. It shows "Misfire" first, then, "fuel", "comp", "catalyst", "evap", "O2 sensor" (which I'm not showing a bad code for??) and "O2 heater". So, if somebody could tell me what the heck they mean and where the cheapest and easiest, or most important to the life of my engine, place to start correcting these I would be grateful. I'm fixing to turn 200,000 and the rest of the car is in pretty good shape, so I want to get these fixed and try to get a little more life out of the engine. Thanks in advance for any help.