I have spent over $4000.00 to have the throttle body replaced, the ECM, all sparkplug wires and plugs, replaced the rotor cap and rotor, replaced throttle body and sensor. Had fuel pump and filter checked. Car will die at slow speed like parking or stopping at a red light. When I hit it hard on the freeway it will hesitate and shudders and feels like it is going to stall. I have no idea except perhaps injectors. It really seems like a fuel problem. The dealer is suggesting that it could be the solenoid sensor for the OD on the transmission and I am taking it in this morning to have that disconnected to see if that helps. They can not find any problems when it is connected to the computer and they scan all systems. Any suggestions???