Need help. First I am not a mechanic and do not pretend to be. I have a 2000 Ranger 6cyl 4.0L. I am having a problem I believe may be fuel injectors. I have a sputter in the engine especially when going up hill or whenever the engine is working hard. At traffic lights it feels like it wants to stall but has not yet. I bought a data plug in tool, Autoxray, which gives me a code for Check Engine light and it said I have 2 lean cyl and detecting a backfire in cyl 7. I tried the cheapest route first, liquid fuel injector cleaner with no result. Just curious? Am I barking up the wrong tree? If not, can I clean or replace the fuel injectors fairly easily myself? Help!!!!