This problem only occurs when my car has been parked for an hour or so with the engine warm. I start it, put it in gear, and the car hesitates and acts like it is about to stall before accelerating. I have a reputable trusted mechanic who ran all sorts of tests, replaced the oxygen sensor and all 8 new injectors, same problem. The scope / analyzer does not show anything wrong. He says that any rotor or spark plug issues would have showed up on the scope.