I've got a 2000 S4 with an APR stage III RS4/K04 kit, GIAC programming, ABT Exhaust and recently my boost has been all outta whack!

I've replaced the MAF and it continues to do the same thing... The car ran at about 1.2Bar, and everynow and then it'll limit itself to about .5bar... I've had it scanned and all it says is Random Misfire Detected... I've since changed the plugs (denso iridiums), plug boots, and temp sensor....

Nothing seems to help. If anyone has encountered this, any info will be greatly appreciated....