Originally Posted by Duceanahalf

when was the last time the tranny was serviced? at 140K then it sould be on its 7th tranny service. Mercon V only.

also a clogged EGR can cause the bucking.

With a coil on plug motor you cant really replace the plug wires, you have to replace the entire coil pack at around $80 per cylinder

if the motor has been running rich it can clog the O2's and clog the EGR passages