Hi all,
My A6 (3.0 fwd, 101K) has been misfiring, getting MIL and the following codes: PO300 (Random misfire) along the following in this order: PO303 – cylinder 3 misfire, PO302 – cylinder 2 misfire, and PO301 - cylinder 1 misfire. Also noted is a higher fuel pressure in the left bank of cylinders than the right bank.
So far we cleaned out the fuel line, replaced all ignition coils, fixed all vacuum leaks and PVC valve to no avail. Spark plugs are new Bosch Paltinum. We swappe the injectors and the problem went away for a coule of days (maybe 60 miles) then CEL came on today - I pulled the following codes: PO300 (Random misfire) and PO302 – cylinder 2

Any ideas?
themahr