My car when at stop in drive or in park is skipping or loosing power.

What is your question?

Nightmare with this car.we had it at four different shops. I can tell you its not the wires plugs censors ,head or catotorlack convertor or hpw ever its spelled. When i crack up the car its like skips or looses power. Also a stop in drive does the same thing. After taking off it runs great after getting it to quit jerking or loosing power.please help.