P0420, P1281, P0171. Rough, cant pass emissions. PLS HELP
 

Good day gents. First of all sorry for my english, Im from Slovakia, so its not perffect. So here is my story and problems. I bought an used 350z year 2005, 206kw, engine code is vq35de, no modes. Mileage is 150 000 km/93000miles. First I had an P0420 and P0430 which is catalytic converter fail or A/F and O2 sensor fail. On emissions they said that my A/F and O2 sensors did not work properly. They should flow from 0,1 to 0,9 V but my BANK 1 is on 0,3 and BANK 2 is on 0,6 V in iddle. When I rev up they flow but they should flow on iddle also. So I decided to change the 2 A/F sensors (bosch) and also 2 bosch O2 sensor on both sides (bank 1 and bank 2). I also changed the cats for 2 new hish flow cats from japspeed. There was no faulty codes anymore and everything looked fine. Than I was on emissions and they said everything is working like before and nothing changed. The lambdas are bad, the CO and emissions are high. WTF?

After a few days new problems started. MY iddle is very rough and also when I accelerate the car is very rough and its like there is no power. Sometimes the engine "dies" and I have to start the car. I put it on OBD2 and it say 3 codes now: P0420, P1281, P0171. Ok, so what now mates? Lambdas are new but dont read properly, cats are new but emiessions are high. What to do now? PLS help me with some advice. Im dont know what to do know :-(

oh god im sorry for posting this in wrong thread. I dont know hot to delete this. PLS admin delete if its possible. Thank you