Engine missing on 1997 Dodge Ram 2500

I have 5.9 360 gas engine i just rebuilt it run good for about 10000 miles now every so often its starts missing and when i gas it it cuts out and back fires. It will do this for a few miles then run fine acts like its flooding

Asked by for the 1997 Dodge Ram 2500
Is the Service Engine Soon/Check Engine Light on if so using a scan tool will narrow down your diagnostic search. I have replaced fuel injectors for a similar problem on the Dodge but if the light is on or not a professional grade scan tool allows testing of sensors and gives air flow into the engine misfire count fuel trim engine load figures ect.. all useful in diagnosing the root cause of the drivability issue.