I would start with the plug wires if they haven't been replaced yet,
several opinions on the site on brands, just don't be cheap.
Spend a good $60-70 for a set. I bought napa's premium set.
Possible plugs or even the fuel filter, just some ideas to get you
started, good luck.
This is similar to the problem I have with my Intreped. I checked my trouble codes and found that my oxygen sensors are shot so I'll be replacing them. Mopar4u is right, check your trouble codes before doing anything.