[john]

If it isn't anything listed above, my next guess would be the ecu. If you have access to another, may as well try it. A unplugged MAS does not always pop a CEL atleast on a 2g gs-t. It made the trip from Hopkins to QPR without a CEL. The car just felt sluggish. Ghettostyle's 2g AWD on the other hand will not rev past 2000 rpm without the MAS plugged in. Depends on the car I quess...