2004 Peugeot 206 SW "po300 multiple po172" Questions

I have a 1998 chevy milibu and I am getting codes po300 and po172 po172 is system rich bank 1 and po300 is multiple cylender misfire. i would get a full tuneup. sparkplugs and sparkplug wires.

...PO300 WHEN TAKING OFF FROM A LIGHT THE CAR HESITATES AND AT LIKE IT IS GOING TO STALL ALSO IT IS RUNNING POORLY The P0172 code is a rich code most likely caused by the P0300. The P0300 is a ...

po300,po455 mean together code p 0172 refers to system too rich bank 1=== causes --intake blocked --EVAP canister purge valve ---fuel pressure --EGR system---injector/s---HO2S ( heated oxygen sensor )

po300 possible solutions P0172 system too rich bank 1. P0300 random multiple misfire. All are a common symptom of either bad fuel pressure regulator or leaking injector. Need to pull off intake plenum

...PO300 Random/multiple cylinder misfire detected PO455Evaporative control system leak detected(gross leak) Where should I start? O2 sensors? Need to diy,can't afford to pay anyone to fix it right now. ...