How many miles on the plug wires, dist. cap/rotor? Also, if it was a misfire in a cylinder the CEL would come on wouldnt it? My friend had the same problem and it ended up being a bad rotor inside the distributor cap, one side was kind of chipped on the rotor so check that out.....it shouldnt be too much to change the cap and rotor should it need those... also, the fuel filters are usually an all or nothing type deal, they either work or they are clogged, but you could change it should it be in an easy place to get to on your car, how many miles do you have on the engine?