I had changed to Mobile in the last two months, can't recall seeing it before then. I'll give the BP fuel another go, failing that its due for a warrant this weekend, might get the mechanic to do a few tests, here's hoping it is a simple fuel issue this car is getting expensive
Is it a Turbo ?, perhaps it could be turbo "blow by". Other thing to check perhaps would be the Dizzy, HT Leads and Plugs, not getting a complete burn of fuel at higher revs mabey.