New to the site, and I like what I see so far.
Problem: my truck has been lacking power and seems like it's mis-firing more now. It just started backfiring under a load. Not all the time, just when I take off from a stop and the RPMs drop to 500 (manual). I've heard it could be the fuel pump, but I'm not sure. Plugs were replaced with champion truck plugs, problem still persisted. Changed the plug wires to mopar performance ones, still there. If it is the fuel pump, where is a cheap place to buy it? So far, the only place I've seen is the stealership.
Oh, one more thing to add. When the RPMs are up around 3-4, it doesn't do it (at least that I can tell). Under 2k and especially under 1500, it does it big-time. Starts bucking like wild. Haven't ran a fuel pressure check on it yet, but I'm pretty sure the fuel filter/pump is the original one (165k).