on the freeway at about 55-60 any thing over half throttle it surges like it cant figure out what gear to be in and from a dead stop it has a bad shutter, the tran fluid was about half quart low so i topped it off and it is a little better, from what i have seen online it cold be plugs and wires, throttle position sensor need adjusting, and it needs a fluid and flush thanks james and it is a 3.4 4 spd auto