2001 Dodge intrepid. 150,000 miles. Transmission fluid was flushed (without my consent) because "it was dirty". This was done while my car was in the shop for other repairs.

About three weeks later the car suddenly starts bucking when I hit about 33mph. Brought it to the dealer, mechanic test drove with me said he thought it might be speed sensor. When the hooked it up it said it gave a code for the valve body. They replaced that for $895.00. The car continued to do the same thing. They have requested 4 hours of diagnostic work at $100/hr. The service manager said they really have no idea what is wrong with it so they want to hook a computer up to each solenoid. I feel like I am getting robbed, I just put over $2000 into this car three weeks ago. Anybody have any ideas?