Misfire on all cylinders on one side

[mrathell]

I just purchased a 2000 X5 for a really good price because it has issues.

I changed the water pump.

It was originally throwing the codes P1421, P0300 & P0306

So I changed all of the spark plugs and the iginition coil for cylinder #6. The old spark plus had carbon build-up but nothing bad and no signs of oil on them.

I cleared the codes and now I'm getting P0300, P0305, P0306, P0307 & P0308.

The X5 still idles rough, but once I put in in drive and start driving, it drives like a dream until you stop at a light and it rough idles again. It's not about to shut off but a rough idle.

When the car is cold, there is a loud ping/clank sound coming from the left rear of the engine. almost as though you are hitting a wrench against metal. It happens once every 10 to 15 seconds and then goes away after the engine warms up.

In the first picture there I circled a hard plastic hose that I have no idea what it plugs into. Any clues?

In the second picture, the x5 came without the 'false firewall' that seperates the engine compartment from the fresh air vents area. it was also missing the plastic piece that goes on top of that. Does anyone know the part numbers for those.

Thanks a million in advance.