injury put new fuelpump n fuel filter in. drove fine for few days. now plugs dry again. what would cause this

more info o2 sensors?

Yeah , I have had my fair share of them , most of it wasn't the cars fault though , plus age. I recently bought myself a scan tool to find out why my car has a hard starting problem when cold ,why it has an intermittant rough idle and why it misfired on acceleration today when cold. It turns out, despite no fault codes being set, only the left hand 02 sensor is working (It's cycling between 0.1 - 0.9 volts) where as the other one on the right hand side is putting out only 0.4 - 0.5 volts (it was sitting at 0.44 volts when I tested it at Maccas yesterday) , this is what I call "stuffed". I've ordered a new one which I'm fitting next week.