" ENGINE APPEARS TO MISFIRE OR STUMBLE INTERMITINTLY
SOLUTION: Replace the ASC control unit. no further diagnosis of the ABS/ASC system should be necessary."

This is excactly whats going on with me, how and where is this unit? how much would it cost?

my rear wheels are slightly larger diameter than the oem, would that be the cause? the size now is 265,45, 17 it should be 265 40 17