One more question before I finally take it in for the crankshaft position sensor fault.

Has anyone else experienced serious surging during light acceleration between 2-3k rpm. More noticeable in lower gears just because it makes a bigger difference, but it feels like a definite fueling issue. Very bumpy, then bigger variations like your e brake gets applied for a random moment or two. Happens the other way as well and you'll get a random pop in the exhaust (no discs) at the same time.

Also having slow to respond clutch issues at the rare almost redline shift. Used launch control the other day and went through 1st and just put the clutch in and stopped, but the clutch would not come back until I put it in neutral and pumped it twice.

 

For the clutch you could try changing the brake fluid to DOT 4 and bleed the whole system till most of the 3 is out. Also check and see if you have the helper spring on the clutch peddle as that seemed to cause it for quite a few 12 guys.

 

Wonger, yes I've had the low surging issue but only when using the Red Track Key. I don't think it is a fault I just believe it has something to do with the track settings? When using the Track key she doesn't like going slow AT ALL!