Look at the O2 Sensor Voltage at Idle.. I'm thinking you are going lean.. Is it both banks.. or just one?.. Do you have a 'Stock' TT how stock is it?.. The Fuel now is different than the Fuel of the '90's.. My NA's have a hard time idling proper on 10% meth fuel for California.. I've actually increased my 'K' Value on my ROM from the Stock 411 to 435 to get my Idle to stay in Feeback Loop.. Please watch your idle voltages on the O2's and report back.. Cap
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