have had this problem for quite a while, seems to be getting worse. Under hard throttle or pulling up a steep incline engine will start to shake like it dropping cylinders. After you back off the throttle the transmission won't shift to overdrive for a while. If you drive like a little old lady it runs ok. New fuel pump, fuel filter, injectors, fuel regulator engine compression good, plug, plug wires cap and rotor inspected and replaced as needed. Sometime will throw a random miss fire code when it has this problem but doesn't show any codes under normal driving conditions. I'm getting tired of throwing money at it. any ideas will help.