I have 2 issues, my car is a 86 911 it has an autothority mass flow on it, at start up the idle will surge radicallyfrom 600 to 1100 rpm, once it straightens itself out, maybe 2 blocks of driving on occassion it will emit a blue fuel rich smoke for a few seconds, car runs great at speed and is extremly responsive, (I have had 22 911s and this 86 accelerates like the 91 and newer I have had), I have checked for vacum leaks, unplugging o2 sensor, no luck. problem 2 on clutch release there is this anoying shudder just as the clutch releases, is can be eratic, worse when car is warm, but persistant, clutch feels fine other than that thanks