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Make sure all your vacuum hoses are connected and in place, also might want to check out the pcv valve usually located on the valve cover. You can also have the fuel regulator checked out... hope one of these things takes care of your problem.
the cat convertor is contaminated with fuel. If the light will not go off (its always on) you have two choices: 1. install new cat(s) or Run premium fuel until light goes out. However before doing either you must first ensure the car's: air filter is new, the spark plugs are new and you put fuel injector cleaner in every tank of fuel. and you might want to replace the O2 sensor in the exhaust pipe. (fuel injectors foul up and cause spilling of fuel instead of spraying atomized fuel and if the spark plugs are fouled they ill not do complete burn of the fuel and therefore cause fuel to get into the cat converter. The O2 sensor can also cause the computer to adjust the timing to fire the plugs and cause similar issues)
have you replace your spark plugs lately, your pcv, cap rotor and wires(use factory replacement they outlast any competition and wont break when checking your plugs), also O2 sensor may be laisy, din't not mention mileage on engine but a fuel injector and trhotle clean will be also recomended.
Your O2 sensor is on exhaust pipe.
What is Sea Foam,and why would you add it?
Nothing I see but the spark plugs,addresses your issues.
Have you looked at the TPS Sensor,with a scanner?
Have you looked at the Ignition with a Scope
Checked MAF Sensor data and cleaned it?
Is the Egr Valve working correctly?
Have you checked fuel pressure?
Are the O2 Sensors,15 years old?
Is the Converter,15 years old and blocked?
well i'm sorry that you got the miss information here on fixya. because all internal combustion engines need a pcv valve to operate properly.
now the information you got first is correct and pcv valve can set false codes like o2's and lean bank conditions also can cause you vechile to run or idle rough.
no there are a few different styles pcv valves and some times don't look like your convetional pcv. some are heated in different ways either by coolant ( witch look like a conventioanl pcv but with a coolant tube around them) then electricaly heated and they don't look like them at all. but one thing that has to stay the same is the pcv valve has to ventilate the crank case and will be found somewhere on or near the valve cover because it is the easiest and most accessible point of the engines crank case area. so i would look for that and usally on that vechile it is on the passanger side valve cover in the middle.
with that said and seeing you did all those repairs i would go right for that as my next step. but there is other thing that cold cause this issue like leaky injectors and is almost more likely becuase of the o2 sensor code and backfire. do you have the code # so i can look it up and best assist you?
see vechiles are hard to fix over the computer as i am trying so if you have any more question/info about this issue please ask and i will be glad to help.
these O2 sensors are cat convertor check sensors. id be checking cat convertors and hopefully you should try replacing if not all ready is the front bank 2, O2 sensor
if you have scanner can you see fuel trims in data display to confirm high fuel trim only on bank 2 either +-5 or more indicates problem and if bank 2 sensor 2 has fixed high 700mv reading cat no good(warm idling)
I doubt if it is the pistons or PVC valve. It is either a fuel or a spark problem. First check the spark and make sure it is good and strong, if you have a strong spark the problem has to be fuel flow related, maybe the fuel pump or the injectors.