97 Sportage Missfire Codes

[MSPRING]

I have a 97 sportage auto trans 4wd that is running rough. While driving sometimes the engine bogs down. If I let off the accelerator a little it gains power but the clutch in the auto transmission seems to slip making the engine rev high. Once again if I let off the gas pedal just a little the clutch seems to catch and it starts to accelerate again. These trouble codes are being displayed in my code scanner:

PO343- CAMSHAFT POSITION SENSOR A-BANK 1 CIRCUT HIGH INPUT
PO141- O2 SENSOR HEATER CIRCUT
PO301- CYLINDER 1 MISSFIRE
PO300- RANDOM MULTIPLE MISSFIRE
PO304- CYLINDER 4 MISFIRE
PO140- O2 CKT NO ACTIVITY
PO107- MAP/BARO CIRCUT LOW INPUT
PO302- CYLINDER 2 MISSFIRE

I would appreciate any good advise.

[kellbell77]

Oh you have some issues. Most of that is gonna be in the valve cover gasket. Sounds like from the codes that there may be oil falling into the spark plugs, which is the #1 cause of misfires, so I would recommend pulling it apart and pulling some plugs and see if you have oil in them. If you do, major issue. And costly if you are not mechanically inclined. I just went thru this with my 2001 Kia. Kia's are known for VALVE cover gaskets going.

Good LUck

[MSPRING]

I have already replaced plugs, wires, both coils, and valve cover gasket.
I also punched out the ceramic in the catalytic converter. After I did that the missfire codes went away now I am getting PO343-camshaft position censor input low.