Stumbling hesitation check engine

Hope you can help.I have a 96 dodge dakota 3.9 auto 4x4 ext cab with 285,000 km on it :shock:. I believe it is multi port fuel injection, a few months back the vehicle started stumbling and the check engine light came on, I replaced the fuel pump and all was well for a while. In the last few weeks it has started doing the same thing and the check engine light came on once more. Before it would only stumble and cough when it had been warmed up, shut off for 15 minutes to a half hour, then restarted, all this with no check engine light. It began stumbling badly and the light came on after driving on the freeway, warmed up completely, when I pulled off the freeway and began stop and go driving again this happened. I dont run the truck under a quarter tank of gas. I am wondering if I am looking at another fuel pump (500$ ouch! ) Or possibly? Any help is greatly appreciated