on my van 1994 v8 5.2 i started it up and was driving and after awhile it start to jerk while i was driving at slows speeds as if it wanted to cut off and when i stoped completly it would cut off but start right up fine i had to hold the brake and tap the gas to keep it from cutting off. and it seem as if it would not change gears when i did put some gas to it i would have to put gas to it and i could hear the engine scream then i had to let my foot off then put some gas to it for it to switch over and when i put it in reverse it jerks real bad and cuts off if i hit the gas. can someone tell me whats going on

 

First things first. Get a code scanner on it and list the codes here.