On some later models your not really supposed to clean the TB bore & butterfly because of
the teflon lining but this may be what's necessary here. Grab a can of carb cleaner and a
really soft bristle toothbrush, hold the butterfly open and clean the inside of the TB out good.
Might also try cleaning the MAF sensor and air temp. sensor in the intake tube. Use ONLY
the CRC brand cleaner specifically for MAF sensors. Others are too strong. Available @ parts
stores only at this time, not Wal-Mart, etc.
Unhook neg. side of battery for 10-15 min's and start over. see what ya get.
GT