Chrysler Repair: fuel injector, dodge dakota, sea foam

Question
I have a 99 dodge Dakota with 5.2. It started missing lately, I added some sea foam, it was supposed to clean the injectors. It did help a little bit but still missing. it seems to come and go. If it is the injectors why would it come and go? If it is an injector, how hard are they to replace??

Answer
the ports for the injectors are smaller then a pin head  so a bit of dirt  or rust in the rail will do this.  If u have a way of reading what cyl is missing  u can move the injector to a different place and see if the miss moves with it.I live in the Atlanta area I would be glad to look at it for u.