Hey all,

I'm hoping you can all help with some issues on my Bora running roughly. I've had the car 2 years, just had a major service and the car has 125K on it. After the major service I bought an aftermarket pod and intake pipe which meant removal of the old airbox etc for it to fit. I bought a new MAF, installed everything after disconnecting the battery etc and restarted the car and it seemed to run pretty well with a wicked induction noise too!

Now though, I am having the following issues:

- If running the car for the first time for the day, car seems to run ok, fuel consumption, power etc, although occasionaly when putting the foot down it will hesitate and splutter
- When running the car again anytime after this, even an hour later the car idles roughly when started, hesitates badly through the gears and fuel consumption seems higher
- Occasionally the car will drop back to idle so low it will stall and sometimes struggles to restart

So, I have take the car to Volkspower in Burwood and they only had time a few weeks ago to run the diagnostics on it, and the main thing that came up was Oxy sensor faults, after faults were cleared at major service. Could this be Coil Pack as well (I have one single coil pack, not 6 individual), and if it is the oxy sensors, how hard are they to replace myself. Also need advice on how many oxy sensors the car has (2001 V6 4Motion) and where I should look to source parts, Ebay has been my only source so far.

Thanks all, any help would be much appreciated!! Trying to save cash where I can so realistic advice on what I can/can't do myself will help based on my experience with servicing tinkering with many different engines in the past with (mostly) successful outcomes.