2002 Dodge Dakota P0320, P0725, P1391

I have a 2002 Dodge Dakota 4.7l v8 with 65k miles on it, never had any troubles of any kind. Coming to work yesterday and the engine chugged on me a few times and the tach went crazy and engine died and wqould not start. I figured CKP but checked codes anyway to confirm. I got codes p0320 and p1391, I went to parts store bought the lifetime ckp and changed ran like a champ again. Took off for work this morning, the same thing happened but now it is also throwing p0725 will not start engine turns over smooth no fire. I am planning on going to the parts store and getting an engine speed sensor, but would like some opinions. And. GO! Please respond asap as I go to lunch in 4 hrs and would like to get this vehicle off of the side of the road immediately after work.